Yicong-Huang commented on code in PR #5375:
URL: https://github.com/apache/texera/pull/5375#discussion_r3771173408
##########
bin/k8s/values.yaml:
##########
@@ -358,6 +358,21 @@ texeraEnvVars:
- name: AUTH_JWT_SECRET
# Development-only default (256-bit HS256 secret). Production environments
MUST override this with a different, securely generated secret.
value: "a7f3c8e9b14d2e6f5a0b9c3d8e1f4a6b2c5d7e9f0a3b6c8d1e4f7a9b2c5d8e1f"
+ # OpenTelemetry (observability). Disabled by default; set OTEL_SDK_DISABLED
to
+ # "false" and point the endpoint at a reachable OTLP collector (http/https
only) to enable.
+ - name: OTEL_SDK_DISABLED
Review Comment:
These five need to land in `bin/k8s/values-development.yaml` as well. Its
`texeraEnvVars` list is otherwise a name-for-name mirror of this one — I sorted
both and diffed: 30 names identical, these five the only difference.
Nothing misbehaves today, because the HOCON defaults happen to match the
values here. That's luck rather than design: change a default in
`observability.conf` and production stays pinned by this file while development
silently follows the new one.
##########
amber/src/main/resources/web-config.yml:
##########
@@ -43,6 +43,18 @@ logging:
level: ${TEXERA_SERVICE_LOG_LEVEL:-INFO}
loggers:
"io.dropwizard": ${TEXERA_SERVICE_LOG_LEVEL:-INFO}
+ # Cap noisy frameworks at WARN so TRACE/DEBUG surfaces Texera code
+ # (org.apache.texera) without the framework firehose.
+ "org.apache.pekko": WARN
Review Comment:
This file's logging block landed, but `TexeraWebApplication` — the service
it configures — never calls `OtelInit.init`. `NotebookMigrationService` is
skipped too; six of eight Dropwizard applications got the line.
The half-landed pairing is what suggests an oversight. `amber` gained
`dependsOn(Observability)` here, so the module is already on the classpath, and
the description says the call went into each service entry point. The main web
backend is the one most worth tracing.
##########
common/observability/src/main/scala/org/apache/texera/observability/OtelInit.scala:
##########
@@ -0,0 +1,403 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.texera.observability
+
+import com.typesafe.scalalogging.LazyLogging
+import org.apache.texera.common.config.{EnvironmentalVariable,
ObservabilityConfig}
+import io.opentelemetry.api.{GlobalOpenTelemetry, OpenTelemetry}
+import io.opentelemetry.api.common.{AttributeKey, Attributes}
+import io.opentelemetry.exporter.otlp.logs.OtlpGrpcLogRecordExporter
+import io.opentelemetry.exporter.otlp.metrics.OtlpGrpcMetricExporter
+import io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporter
+import io.opentelemetry.sdk.OpenTelemetrySdk
+import io.opentelemetry.sdk.logs.SdkLoggerProvider
+import io.opentelemetry.sdk.logs.`export`.{BatchLogRecordProcessor,
LogRecordExporter}
+import io.opentelemetry.sdk.metrics.SdkMeterProvider
+import io.opentelemetry.sdk.metrics.`export`.{MetricExporter,
PeriodicMetricReader}
+import io.opentelemetry.sdk.resources.Resource
+import io.opentelemetry.sdk.trace.SdkTracerProvider
+import io.opentelemetry.sdk.trace.`export`.{BatchSpanProcessor, SpanExporter}
+
+import java.net.URI
+import java.time.Duration
+import scala.util.{Failure, Success, Try}
+
+/**
+ * Bootstraps the OpenTelemetry SDK for a Texera service.
+ *
+ * Disabled by default; set OTEL_SDK_DISABLED=false to enable it. Reads its
+ * settings from observability.conf (each defaulted, each OTEL_*-overridable),
+ * validates the endpoint against an allowlist, builds tracer/log/metric
+ * providers, and attaches a Logback appender. Returns None when disabled or
+ * misconfigured; never throws.
+ */
+object OtelInit extends LazyLogging {
+
+ /** Endpoint schemes we accept. OTLP-over-gRPC uses http/https endpoints;
+ * the exporter rejects a `grpc://` scheme outright, so it is not allowed.
+ */
+ private[observability] val AllowedSchemes: Set[String] = Set("http", "https")
+
+ /** Hosts we accept for the OTLP endpoint by default. */
+ private[observability] val DefaultAllowedHosts: Set[String] = Set(
+ "localhost",
+ "127.0.0.1",
+ "[::1]"
+ )
+
+ /** Default endpoint. 127.0.0.1 (not "localhost") to force IPv4 so a
+ * natively-run service reaches the collector on dual-stack hosts.
+ */
+ private val DefaultEndpoint = "http://127.0.0.1:4317";
+
+ /** Metric export interval bounds; out-of-range values fall back to the
+ * default (see clampIntervalMs).
+ */
+ private[observability] val MinMetricIntervalMs: Long = 1000L
+ private[observability] val MaxMetricIntervalMs: Long = 10L * 60L * 1000L
+ private[observability] val DefaultMetricIntervalMs: Long = 30L * 1000L
+
+ // Idempotency guard: init() is a no-op after the first call.
+ @volatile private var initialized: Option[OpenTelemetry] = None
+
+ /**
+ * Initialize the SDK for the given service name. Returns Some on
+ * success, None when disabled or misconfigured. When enabled, also
+ * attaches a [[TexeraOtelLogAppender]] to the Logback ROOT logger.
+ */
+ def init(serviceName: String): Option[OpenTelemetry] =
+ synchronized {
+ if (initialized.isDefined) return initialized
+
+ // Source the OTEL_* settings from observability.conf (HOCON defaults
+ // already merged with any env override); fall back to the raw
environment
+ // for anything else.
+ val env = (key: String) =>
+ key match {
+ case EnvironmentalVariable.ENV_OTEL_SDK_DISABLED =>
Some(ObservabilityConfig.sdkDisabled)
+ case EnvironmentalVariable.ENV_OTEL_EXPORTER_OTLP_ENDPOINT =>
+ Some(ObservabilityConfig.endpoint)
+ case EnvironmentalVariable.ENV_OTEL_RESOURCE_ATTRIBUTES =>
+ Some(ObservabilityConfig.resourceAttributes)
+ case EnvironmentalVariable.ENV_TEXERA_OTEL_ALLOWED_HOSTS =>
+ Some(ObservabilityConfig.allowedHosts)
+ case EnvironmentalVariable.ENV_OTEL_METRIC_EXPORT_INTERVAL =>
+ Some(ObservabilityConfig.metricExportIntervalMs)
+ case other => Option(System.getenv(other))
+ }
+ val result = initInternal(
+ serviceName = serviceName,
+ envProvider = env,
+ spanExporterFactory = buildOtlpSpanExporter,
+ logExporterFactory = endpoint => Some(buildOtlpLogExporter(endpoint)),
+ metricExporterFactory = endpoint =>
Some(buildOtlpMetricExporter(endpoint)),
+ logbackAttacher = LogbackBinder.attach
+ )
+ // Register globally so OTel-aware code can use GlobalOpenTelemetry
+ // without threading the SDK through callsites. set() throws on a
+ // second call; wrap defensively.
+ result.foreach { sdk =>
+ Try(GlobalOpenTelemetry.set(sdk)).failed.foreach { t =>
+ logger.warn(
+ s"GlobalOpenTelemetry already set; using the existing instance:
${t.getMessage}"
+ )
+ }
+ }
+ result
+ }
+
+ /**
+ * Test-only entry point: injects an env-var map and exporters so the
+ * SDK makes no network connection. Does not attach the Logback appender.
+ */
+ private[observability] def initForTest(
+ serviceName: String,
+ envOverride: Map[String, String],
+ exporter: SpanExporter,
+ metricExporter: Option[MetricExporter] = None
+ ): Option[OpenTelemetry] =
+ synchronized {
+ initInternal(
+ serviceName = serviceName,
+ envProvider = envOverride.get,
+ spanExporterFactory = _ => exporter,
+ logExporterFactory = _ => None,
+ metricExporterFactory = _ => metricExporter,
+ logbackAttacher = (_, _) => () // no-op in tests
+ )
+ }
+
+ /** Test-only: forget any previously-installed SDK. Does not unregister
+ * shutdown hooks (the previous SDK is closed instead).
+ */
+ private[observability] def resetForTest(): Unit =
+ synchronized {
+ initialized.foreach {
+ case sdk: OpenTelemetrySdk =>
+ Try(sdk.getSdkTracerProvider.close())
+ Try(sdk.getSdkLoggerProvider.close())
+ Try(sdk.getSdkMeterProvider.close())
+ case _ => ()
+ }
+ initialized = None
+ }
+
+ private def initInternal(
+ serviceName: String,
+ envProvider: String => Option[String],
+ spanExporterFactory: String => SpanExporter,
+ logExporterFactory: String => Option[LogRecordExporter],
+ metricExporterFactory: String => Option[MetricExporter],
+ logbackAttacher: (String, OpenTelemetry) => Unit
+ ): Option[OpenTelemetry] = {
+ if (initialized.isDefined) return initialized
+
+ // Disabled by default (issue #5367): stay inert unless OTEL_SDK_DISABLED
is
+ // explicitly false. An unreachable endpoint drops records without
crashing.
+ val disabled =
envProvider(EnvironmentalVariable.ENV_OTEL_SDK_DISABLED).getOrElse("true")
Review Comment:
This evaluates `ObservabilityConfig`'s eager vals — the one unguarded step
in a method documented as never throwing (:49). A missing or malformed
`observability.conf` escapes as `ExceptionInInitializerError` and fails the
service's `run()`. It also runs before the disabled gate below, so a deployment
with telemetry off can still fail to boot over a config file it never uses.
Every other fallible step here is wrapped (`Try` at :117, :245, :249;
`Either` at :189). That per-call habit already missed once in this PR — the
`grpc://` escape was an unguarded builder call in this same method. One `Try`
around `initInternal`'s body, returning `None` with a WARN, makes the contract
structural.
##########
common/observability/src/main/scala/org/apache/texera/observability/TexeraOtelLogAppender.scala:
##########
@@ -0,0 +1,127 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.texera.observability
+
+import ch.qos.logback.classic.Level
+import ch.qos.logback.classic.spi.{ILoggingEvent, IThrowableProxy,
ThrowableProxyUtil}
+import ch.qos.logback.core.UnsynchronizedAppenderBase
+import io.opentelemetry.api.OpenTelemetry
+import io.opentelemetry.api.common.AttributeKey
+import io.opentelemetry.api.logs.{Logger, Severity}
+import io.opentelemetry.api.trace.Span
+import io.opentelemetry.context.Context
+
+import java.util.concurrent.TimeUnit
+
+/**
+ * Logback appender that sanitizes each event via [[LogSanitizer]] and
+ * emits it as an OTel LogRecord. [[append]] is a no-op until [[bind]]
+ * is called and after [[stop]].
+ *
+ * This is internal plumbing, not the developer logging API. Code logs
+ * through the normal SLF4J / scala-logging interface and adds correlation
+ * ids via MDC; [[OtelInit.init]] attaches this appender to the ROOT logger
+ * so those records also reach OTel:
+ *
+ * {{{
+ * class Foo extends LazyLogging {
+ * MDC.put("workflowId", id) // forwarded as an OTel log attribute
+ * try logger.info("started") // body + severity + trace context
+ * finally MDC.remove("workflowId")
+ * }
+ * }}}
+ */
+class TexeraOtelLogAppender extends UnsynchronizedAppenderBase[ILoggingEvent] {
+
+ // @volatile so a late bind() is visible to appender threads.
+ @volatile private var otelLogger: Option[Logger] = None
+
+ def bind(otel: OpenTelemetry): Unit = {
+ otelLogger = Some(otel.getLogsBridge.get("texera.logback"))
+ }
+
+ override def stop(): Unit = {
+ otelLogger = None
+ super.stop()
+ }
+
+ override def append(event: ILoggingEvent): Unit = {
+ otelLogger match {
+ case None => () // not bound
+ case Some(logger) =>
+ try {
+ emit(logger, event)
+ } catch {
+ // An appender must not throw into the calling thread.
+ case t: Throwable =>
+ addError("OTel log emission failed", t)
+ }
+ }
+ }
+
+ private def emit(logger: Logger, event: ILoggingEvent): Unit = {
+ // Control-strip the message only (trace newlines must survive), then
append
+ // the stack trace, redact secrets across the whole body, and cap length.
+ val message = LogSanitizer.stripControlChars(event.getFormattedMessage)
+ val combined = Option(event.getThrowableProxy) match {
+ case Some(proxy) => message + "\n" + formatThrowable(proxy)
Review Comment:
Worth also setting the `exception.*` semantic-convention attributes, not
just body text. Backends key error identity off `exception.type` and
`exception.message`. As written the trace ships as opaque body text, so the
exception isn't queryable as one — which undercuts the goal of keeping
Dropwizard 500s diagnosable from the dashboard.
Upstream's `opentelemetry-logback-appender-1.0` populates these; build.sbt's
rationale for avoiding upstream machinery covers `sdk-extension-autoconfigure`
only. Additive, so a follow-up is fine — raising it because this is the
foundation everything inherits.
##########
common/observability/build.sbt:
##########
@@ -0,0 +1,73 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+import scala.collection.Seq
+
+name := "observability"
+
+
+enablePlugins(JavaAppPackaging)
+
+// Enable semanticdb for Scalafix
+ThisBuild / semanticdbEnabled := true
+ThisBuild / semanticdbVersion := scalafixSemanticdb.revision
+
+// Manage dependency conflicts by always using the latest revision
+ThisBuild / conflictManager := ConflictManager.latestRevision
+
+// Restrict parallel execution of tests to avoid conflicts
+Global / concurrentRestrictions += Tags.limit(Tags.Test, 1)
+
+/////////////////////////////////////////////////////////////////////////////
+// Compiler Options
+/////////////////////////////////////////////////////////////////////////////
+
+// Scala compiler options
+Compile / scalacOptions ++= Seq(
+ "-Xelide-below", "WARNING", // Turn on optimizations with "WARNING" as
the threshold
+ "-feature", // Check feature warnings
+ "-deprecation", // Check deprecation warnings
+ "-Ywarn-unused:imports" // Check for unused imports
+)
+
+/////////////////////////////////////////////////////////////////////////////
+// Dependencies
+/////////////////////////////////////////////////////////////////////////////
+
+// OpenTelemetry version is pinned here as the single source of truth; every
+// service picks it up via dependsOn(Observability). Bump deliberately.
+val openTelemetryVersion = "1.50.0"
+
+libraryDependencies ++= Seq(
+ "com.typesafe.scala-logging" %% "scala-logging" % "3.9.5", // for
LazyLogging in OtelInit
+ // OpenTelemetry SDK bootstrap (Apache-2.0). We deliberately do NOT use
+ // sdk-extension-autoconfigure: the security model requires that endpoint
+ // + resource-attribute filtering run before any exporter is configured.
Review Comment:
The resource-attribute half of this rationale no longer holds —
`buildResource` applies every parsed attribute and protects only
`service.name`. Endpoint filtering is still a real reason to skip autoconfigure.
```suggestion
// + endpoint filtering run before any exporter is configured.
```
##########
common/observability/src/main/scala/org/apache/texera/observability/LogSanitizer.scala:
##########
@@ -0,0 +1,122 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.texera.observability
+
+import scala.jdk.CollectionConverters._
+
+/**
+ * Pure functions that sanitize log bodies and MDC before export:
+ * strip control characters, redact secrets, cap body size, and
+ * filter MDC down by dropping denied keys.
+ */
+object LogSanitizer {
+
+ /** Per-record body length cap, in chars. */
+ val MaxBodyBytes: Int = 16 * 1024
Review Comment:
`truncate` compares `body.length`, so this caps UTF-16 chars, not bytes. The
scaladoc above now says "in chars" — the name still says bytes, and so does the
description's "cap 16 KiB".
This one is my residue: last round I suggested fixing only the comment and
you applied exactly that. `MaxBodyChars` would settle it, touching the scaladoc
at :106 and the two spec references (so not a one-click suggestion).
##########
common/observability/src/main/scala/org/apache/texera/observability/OtelInit.scala:
##########
@@ -0,0 +1,403 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.texera.observability
+
+import com.typesafe.scalalogging.LazyLogging
+import org.apache.texera.common.config.{EnvironmentalVariable,
ObservabilityConfig}
+import io.opentelemetry.api.{GlobalOpenTelemetry, OpenTelemetry}
+import io.opentelemetry.api.common.{AttributeKey, Attributes}
+import io.opentelemetry.exporter.otlp.logs.OtlpGrpcLogRecordExporter
+import io.opentelemetry.exporter.otlp.metrics.OtlpGrpcMetricExporter
+import io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporter
+import io.opentelemetry.sdk.OpenTelemetrySdk
+import io.opentelemetry.sdk.logs.SdkLoggerProvider
+import io.opentelemetry.sdk.logs.`export`.{BatchLogRecordProcessor,
LogRecordExporter}
+import io.opentelemetry.sdk.metrics.SdkMeterProvider
+import io.opentelemetry.sdk.metrics.`export`.{MetricExporter,
PeriodicMetricReader}
+import io.opentelemetry.sdk.resources.Resource
+import io.opentelemetry.sdk.trace.SdkTracerProvider
+import io.opentelemetry.sdk.trace.`export`.{BatchSpanProcessor, SpanExporter}
+
+import java.net.URI
+import java.time.Duration
+import scala.util.{Failure, Success, Try}
+
+/**
+ * Bootstraps the OpenTelemetry SDK for a Texera service.
+ *
+ * Disabled by default; set OTEL_SDK_DISABLED=false to enable it. Reads its
+ * settings from observability.conf (each defaulted, each OTEL_*-overridable),
+ * validates the endpoint against an allowlist, builds tracer/log/metric
+ * providers, and attaches a Logback appender. Returns None when disabled or
+ * misconfigured; never throws.
+ */
+object OtelInit extends LazyLogging {
+
+ /** Endpoint schemes we accept. OTLP-over-gRPC uses http/https endpoints;
+ * the exporter rejects a `grpc://` scheme outright, so it is not allowed.
+ */
+ private[observability] val AllowedSchemes: Set[String] = Set("http", "https")
+
+ /** Hosts we accept for the OTLP endpoint by default. */
+ private[observability] val DefaultAllowedHosts: Set[String] = Set(
+ "localhost",
+ "127.0.0.1",
+ "[::1]"
+ )
+
+ /** Default endpoint. 127.0.0.1 (not "localhost") to force IPv4 so a
+ * natively-run service reaches the collector on dual-stack hosts.
+ */
+ private val DefaultEndpoint = "http://127.0.0.1:4317";
+
+ /** Metric export interval bounds; out-of-range values fall back to the
+ * default (see clampIntervalMs).
+ */
+ private[observability] val MinMetricIntervalMs: Long = 1000L
+ private[observability] val MaxMetricIntervalMs: Long = 10L * 60L * 1000L
+ private[observability] val DefaultMetricIntervalMs: Long = 30L * 1000L
+
+ // Idempotency guard: init() is a no-op after the first call.
+ @volatile private var initialized: Option[OpenTelemetry] = None
+
+ /**
+ * Initialize the SDK for the given service name. Returns Some on
+ * success, None when disabled or misconfigured. When enabled, also
+ * attaches a [[TexeraOtelLogAppender]] to the Logback ROOT logger.
+ */
+ def init(serviceName: String): Option[OpenTelemetry] =
+ synchronized {
+ if (initialized.isDefined) return initialized
+
+ // Source the OTEL_* settings from observability.conf (HOCON defaults
+ // already merged with any env override); fall back to the raw
environment
+ // for anything else.
+ val env = (key: String) =>
+ key match {
+ case EnvironmentalVariable.ENV_OTEL_SDK_DISABLED =>
Some(ObservabilityConfig.sdkDisabled)
+ case EnvironmentalVariable.ENV_OTEL_EXPORTER_OTLP_ENDPOINT =>
+ Some(ObservabilityConfig.endpoint)
+ case EnvironmentalVariable.ENV_OTEL_RESOURCE_ATTRIBUTES =>
+ Some(ObservabilityConfig.resourceAttributes)
+ case EnvironmentalVariable.ENV_TEXERA_OTEL_ALLOWED_HOSTS =>
+ Some(ObservabilityConfig.allowedHosts)
+ case EnvironmentalVariable.ENV_OTEL_METRIC_EXPORT_INTERVAL =>
+ Some(ObservabilityConfig.metricExportIntervalMs)
+ case other => Option(System.getenv(other))
+ }
+ val result = initInternal(
+ serviceName = serviceName,
+ envProvider = env,
+ spanExporterFactory = buildOtlpSpanExporter,
+ logExporterFactory = endpoint => Some(buildOtlpLogExporter(endpoint)),
+ metricExporterFactory = endpoint =>
Some(buildOtlpMetricExporter(endpoint)),
+ logbackAttacher = LogbackBinder.attach
+ )
+ // Register globally so OTel-aware code can use GlobalOpenTelemetry
+ // without threading the SDK through callsites. set() throws on a
+ // second call; wrap defensively.
+ result.foreach { sdk =>
+ Try(GlobalOpenTelemetry.set(sdk)).failed.foreach { t =>
+ logger.warn(
+ s"GlobalOpenTelemetry already set; using the existing instance:
${t.getMessage}"
+ )
+ }
+ }
+ result
+ }
+
+ /**
+ * Test-only entry point: injects an env-var map and exporters so the
+ * SDK makes no network connection. Does not attach the Logback appender.
+ */
+ private[observability] def initForTest(
+ serviceName: String,
+ envOverride: Map[String, String],
+ exporter: SpanExporter,
+ metricExporter: Option[MetricExporter] = None
+ ): Option[OpenTelemetry] =
+ synchronized {
+ initInternal(
+ serviceName = serviceName,
+ envProvider = envOverride.get,
+ spanExporterFactory = _ => exporter,
+ logExporterFactory = _ => None,
+ metricExporterFactory = _ => metricExporter,
+ logbackAttacher = (_, _) => () // no-op in tests
+ )
+ }
+
+ /** Test-only: forget any previously-installed SDK. Does not unregister
+ * shutdown hooks (the previous SDK is closed instead).
+ */
+ private[observability] def resetForTest(): Unit =
+ synchronized {
+ initialized.foreach {
+ case sdk: OpenTelemetrySdk =>
+ Try(sdk.getSdkTracerProvider.close())
+ Try(sdk.getSdkLoggerProvider.close())
+ Try(sdk.getSdkMeterProvider.close())
+ case _ => ()
+ }
+ initialized = None
+ }
+
+ private def initInternal(
+ serviceName: String,
+ envProvider: String => Option[String],
+ spanExporterFactory: String => SpanExporter,
+ logExporterFactory: String => Option[LogRecordExporter],
+ metricExporterFactory: String => Option[MetricExporter],
+ logbackAttacher: (String, OpenTelemetry) => Unit
+ ): Option[OpenTelemetry] = {
+ if (initialized.isDefined) return initialized
+
+ // Disabled by default (issue #5367): stay inert unless OTEL_SDK_DISABLED
is
+ // explicitly false. An unreachable endpoint drops records without
crashing.
+ val disabled =
envProvider(EnvironmentalVariable.ENV_OTEL_SDK_DISABLED).getOrElse("true")
+ if (!disabled.equalsIgnoreCase("false")) {
+ logger.info(
+ "OpenTelemetry SDK disabled (OTEL_SDK_DISABLED not false). No
telemetry will be emitted."
+ )
+ return None
+ }
+
+ val endpoint =
+
envProvider(EnvironmentalVariable.ENV_OTEL_EXPORTER_OTLP_ENDPOINT).getOrElse(DefaultEndpoint)
+ val extraAllowed =
envProvider(EnvironmentalVariable.ENV_TEXERA_OTEL_ALLOWED_HOSTS)
+
.map(_.split(',').iterator.map(_.trim.toLowerCase).filter(_.nonEmpty).toSet)
+ .getOrElse(Set.empty)
+ val allowedHosts = DefaultAllowedHosts ++ extraAllowed
+
+ validateEndpoint(endpoint, allowedHosts) match {
+ case Left(reason) =>
+ // One WARN; no telemetry is emitted.
+ logger.warn(
+ s"OpenTelemetry SDK disabled: invalid OTEL_EXPORTER_OTLP_ENDPOINT —
$reason. " +
+ "Set TEXERA_OTEL_ALLOWED_HOSTS to extend the allowlist."
+ )
+ return None
+ case Right(_) => // ok
+ }
+
+ val rawAttrs =
envProvider(EnvironmentalVariable.ENV_OTEL_RESOURCE_ATTRIBUTES).getOrElse("")
+ val resource = buildResource(serviceName, rawAttrs)
+
+ val spanExporter = spanExporterFactory(endpoint)
+ val tracerProvider = SdkTracerProvider
+ .builder()
+ .setResource(resource)
+ .addSpanProcessor(BatchSpanProcessor.builder(spanExporter).build())
+ .build()
+
+ val sdkBuilder =
OpenTelemetrySdk.builder().setTracerProvider(tracerProvider)
+
+ // Logger provider is optional; the factory returns None in tests.
+ val loggerProviderOpt = logExporterFactory(endpoint).map { logExporter =>
+ val lp = SdkLoggerProvider
+ .builder()
+ .setResource(resource)
+
.addLogRecordProcessor(BatchLogRecordProcessor.builder(logExporter).build())
+ .build()
+ sdkBuilder.setLoggerProvider(lp)
+ lp
+ }
+
+ // Meter provider is optional too; interval falls back to the default
+ // when out of range.
+ val intervalMs =
+
clampIntervalMs(envProvider(EnvironmentalVariable.ENV_OTEL_METRIC_EXPORT_INTERVAL))
+ val meterProviderOpt = metricExporterFactory(endpoint).map {
metricExporter =>
+ val reader = PeriodicMetricReader
+ .builder(metricExporter)
+ .setInterval(Duration.ofMillis(intervalMs))
+ .build()
+ val mp = SdkMeterProvider
+ .builder()
+ .setResource(resource)
+ .registerMetricReader(reader)
+ .build()
+ sdkBuilder.setMeterProvider(mp)
+ mp
+ }
+
+ val sdk = sdkBuilder.build()
+
+ // One startup span carrying only service.name.
+ val span =
sdk.getTracer("texera.bootstrap").spanBuilder("service.start").startSpan()
+ Try(span.setAttribute("service.name", serviceName))
+ span.end()
+
+ // Wire the Logback appender; failure here must not crash the service.
+ Try(logbackAttacher(serviceName, sdk)).failed.foreach { t =>
+ logger.warn(s"Failed to attach OTel Logback appender (logs not
exported): ${t.getMessage}")
+ }
+
+ // Flush providers on shutdown. Added after the SDK is fully built.
+ Runtime.getRuntime.addShutdownHook(
+ new Thread(
+ () => {
+ Try(tracerProvider.close())
+ loggerProviderOpt.foreach(lp => Try(lp.close()))
+ meterProviderOpt.foreach(mp => Try(mp.close()))
+ ()
+ },
+ "otel-shutdown"
+ )
+ )
+
+ initialized = Some(sdk)
+ logger.info(s"OpenTelemetry SDK initialized for service '$serviceName'
(endpoint=$endpoint).")
+ initialized
+ }
+
+ /**
+ * Validate the endpoint is parseable and uses an allowlisted scheme
+ * and host. Pure function.
+ */
+ private[observability] def validateEndpoint(
+ endpoint: String,
+ allowedHosts: Set[String]
+ ): Either[String, Unit] = {
+ Try(URI.create(endpoint)) match {
+ case Failure(e) =>
+ Left(s"unparseable URI (${e.getClass.getSimpleName})")
+ case Success(uri) =>
+ val scheme = Option(uri.getScheme).map(_.toLowerCase).getOrElse("")
+ if (scheme.isEmpty) {
+ Left("missing scheme")
+ } else if (!AllowedSchemes.contains(scheme)) {
+ Left(
+ s"scheme '$scheme' not in allowlist
${AllowedSchemes.toSeq.sorted.mkString("{", ",", "}")}"
+ )
+ } else {
+ val host = Option(uri.getHost).map(_.toLowerCase).getOrElse("")
+ if (host.isEmpty) {
+ Left("missing host")
+ } else if (!allowedHosts.contains(host)) {
+ Left(s"host '$host' not in allowlist")
+ } else {
+ Right(())
+ }
+ }
+ }
+ }
+
+ /**
+ * Build a Resource from the service name and OTEL_RESOURCE_ATTRIBUTES.
+ * Every parsed attribute is applied so new resource fields need no edit
+ * here; the one exception is service.name, which the argument controls
+ * and env cannot override.
+ */
+ private[observability] def buildResource(serviceName: String, rawAttrs:
String): Resource = {
+ val builder = Attributes.builder()
+ builder.put(AttributeKey.stringKey("service.name"), serviceName)
+
+ parseAttrs(rawAttrs).foreach {
+ case (key, value) if key != "service.name" =>
+ builder.put(AttributeKey.stringKey(key), value)
+ case _ => // env cannot override service.name
+ }
+
+ Resource.create(builder.build())
+ }
+
+ /** Parse a `k1=v1,k2=v2` string. Malformed entries are skipped. */
+ private[observability] def parseAttrs(raw: String): Seq[(String, String)] = {
+ if (raw == null || raw.isEmpty) return Seq.empty
+ raw
+ .split(',')
+ .iterator
+ .map(_.trim)
+ .filter(_.nonEmpty)
+ .flatMap { entry =>
+ val idx = entry.indexOf('=')
+ if (idx <= 0 || idx == entry.length - 1) None
+ else Some(entry.substring(0, idx).trim -> entry.substring(idx +
1).trim)
+ }
+ .toSeq
+ }
+
+ private def buildOtlpSpanExporter(endpoint: String): SpanExporter =
+ OtlpGrpcSpanExporter.builder().setEndpoint(endpoint).build()
+
+ private def buildOtlpLogExporter(endpoint: String): LogRecordExporter =
+ OtlpGrpcLogRecordExporter.builder().setEndpoint(endpoint).build()
+
+ private def buildOtlpMetricExporter(endpoint: String): MetricExporter =
+ OtlpGrpcMetricExporter.builder().setEndpoint(endpoint).build()
+
+ /**
+ * Parse and clamp OTEL_METRIC_EXPORT_INTERVAL (ms). Out-of-range or
+ * unparseable input falls back to the default with one WARN.
+ */
+ private[observability] def clampIntervalMs(raw: Option[String]): Long = {
+ raw match {
+ case None => DefaultMetricIntervalMs
+ case Some(value) =>
+ Try(value.trim.toLong) match {
+ case Failure(_) =>
+ logger.warn(
+ s"OTEL_METRIC_EXPORT_INTERVAL '$value' is not a number; " +
+ s"using default ${DefaultMetricIntervalMs}ms."
+ )
+ DefaultMetricIntervalMs
+ case Success(ms) if ms < MinMetricIntervalMs || ms >
MaxMetricIntervalMs =>
+ logger.warn(
+ s"OTEL_METRIC_EXPORT_INTERVAL=${ms}ms out of range " +
+ s"[${MinMetricIntervalMs}, ${MaxMetricIntervalMs}]; " +
+ s"using default ${DefaultMetricIntervalMs}ms."
+ )
+ DefaultMetricIntervalMs
+ case Success(ms) => ms
+ }
+ }
+ }
+}
+
+/**
+ * Isolates the Logback attach step so [[OtelInit]] does not import
+ * Logback types directly, keeping SDK init testable with a mock attacher.
+ */
+private[observability] object LogbackBinder extends LazyLogging {
+
+ /** Attach a [[TexeraOtelLogAppender]] bound to `otel` to the Logback
+ * ROOT logger. Emits one WARN and returns if Logback is not the
+ * active SLF4J binding.
+ */
+ def attach(serviceName: String, otel: OpenTelemetry): Unit = {
+ val factory = org.slf4j.LoggerFactory.getILoggerFactory
+ factory match {
+ case ctx: ch.qos.logback.classic.LoggerContext =>
+ val root = ctx.getLogger(org.slf4j.Logger.ROOT_LOGGER_NAME)
+ val appender = new TexeraOtelLogAppender()
+ appender.setContext(ctx)
+ appender.setName(s"texera-otel-$serviceName")
+ appender.bind(otel)
+ appender.start()
+ root.addAppender(appender)
Review Comment:
Attaching to ROOT with no logger-name exclusion feeds the exporter's own
failure diagnostics back into that exporter.
I traced both links. OTel logs internally via `java.util.logging` —
`BatchLogRecordProcessor$Worker` and `ThrottlingLogger` in the pinned 1.50.0
jars both reference it. And `org.slf4j.jul-to-slf4j` sits on every service's
classpath per all six `LICENSE-binary` files, purely to install the bridge. So
a failed export logs, reaches Logback ROOT, hits this appender, and is queued
for the collector that just failed.
`ThrottlingLogger` caps the rate, so this degrades rather than melts down —
but that bound is the library's, not ours. Skipping `io.opentelemetry` logger
names in `append` would make it ours.
##########
common/observability/src/main/scala/org/apache/texera/observability/OtelInit.scala:
##########
@@ -0,0 +1,403 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.texera.observability
+
+import com.typesafe.scalalogging.LazyLogging
+import org.apache.texera.common.config.{EnvironmentalVariable,
ObservabilityConfig}
+import io.opentelemetry.api.{GlobalOpenTelemetry, OpenTelemetry}
+import io.opentelemetry.api.common.{AttributeKey, Attributes}
+import io.opentelemetry.exporter.otlp.logs.OtlpGrpcLogRecordExporter
+import io.opentelemetry.exporter.otlp.metrics.OtlpGrpcMetricExporter
+import io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporter
+import io.opentelemetry.sdk.OpenTelemetrySdk
+import io.opentelemetry.sdk.logs.SdkLoggerProvider
+import io.opentelemetry.sdk.logs.`export`.{BatchLogRecordProcessor,
LogRecordExporter}
+import io.opentelemetry.sdk.metrics.SdkMeterProvider
+import io.opentelemetry.sdk.metrics.`export`.{MetricExporter,
PeriodicMetricReader}
+import io.opentelemetry.sdk.resources.Resource
+import io.opentelemetry.sdk.trace.SdkTracerProvider
+import io.opentelemetry.sdk.trace.`export`.{BatchSpanProcessor, SpanExporter}
+
+import java.net.URI
+import java.time.Duration
+import scala.util.{Failure, Success, Try}
+
+/**
+ * Bootstraps the OpenTelemetry SDK for a Texera service.
+ *
+ * Disabled by default; set OTEL_SDK_DISABLED=false to enable it. Reads its
+ * settings from observability.conf (each defaulted, each OTEL_*-overridable),
+ * validates the endpoint against an allowlist, builds tracer/log/metric
+ * providers, and attaches a Logback appender. Returns None when disabled or
+ * misconfigured; never throws.
+ */
+object OtelInit extends LazyLogging {
+
+ /** Endpoint schemes we accept. OTLP-over-gRPC uses http/https endpoints;
+ * the exporter rejects a `grpc://` scheme outright, so it is not allowed.
+ */
+ private[observability] val AllowedSchemes: Set[String] = Set("http", "https")
+
+ /** Hosts we accept for the OTLP endpoint by default. */
+ private[observability] val DefaultAllowedHosts: Set[String] = Set(
+ "localhost",
+ "127.0.0.1",
+ "[::1]"
+ )
+
+ /** Default endpoint. 127.0.0.1 (not "localhost") to force IPv4 so a
+ * natively-run service reaches the collector on dual-stack hosts.
+ */
+ private val DefaultEndpoint = "http://127.0.0.1:4317";
+
+ /** Metric export interval bounds; out-of-range values fall back to the
+ * default (see clampIntervalMs).
+ */
+ private[observability] val MinMetricIntervalMs: Long = 1000L
+ private[observability] val MaxMetricIntervalMs: Long = 10L * 60L * 1000L
+ private[observability] val DefaultMetricIntervalMs: Long = 30L * 1000L
+
+ // Idempotency guard: init() is a no-op after the first call.
+ @volatile private var initialized: Option[OpenTelemetry] = None
+
+ /**
+ * Initialize the SDK for the given service name. Returns Some on
+ * success, None when disabled or misconfigured. When enabled, also
+ * attaches a [[TexeraOtelLogAppender]] to the Logback ROOT logger.
+ */
+ def init(serviceName: String): Option[OpenTelemetry] =
+ synchronized {
+ if (initialized.isDefined) return initialized
+
+ // Source the OTEL_* settings from observability.conf (HOCON defaults
+ // already merged with any env override); fall back to the raw
environment
+ // for anything else.
+ val env = (key: String) =>
+ key match {
+ case EnvironmentalVariable.ENV_OTEL_SDK_DISABLED =>
Some(ObservabilityConfig.sdkDisabled)
+ case EnvironmentalVariable.ENV_OTEL_EXPORTER_OTLP_ENDPOINT =>
+ Some(ObservabilityConfig.endpoint)
+ case EnvironmentalVariable.ENV_OTEL_RESOURCE_ATTRIBUTES =>
+ Some(ObservabilityConfig.resourceAttributes)
+ case EnvironmentalVariable.ENV_TEXERA_OTEL_ALLOWED_HOSTS =>
+ Some(ObservabilityConfig.allowedHosts)
+ case EnvironmentalVariable.ENV_OTEL_METRIC_EXPORT_INTERVAL =>
+ Some(ObservabilityConfig.metricExportIntervalMs)
+ case other => Option(System.getenv(other))
+ }
+ val result = initInternal(
+ serviceName = serviceName,
+ envProvider = env,
+ spanExporterFactory = buildOtlpSpanExporter,
+ logExporterFactory = endpoint => Some(buildOtlpLogExporter(endpoint)),
+ metricExporterFactory = endpoint =>
Some(buildOtlpMetricExporter(endpoint)),
+ logbackAttacher = LogbackBinder.attach
+ )
+ // Register globally so OTel-aware code can use GlobalOpenTelemetry
+ // without threading the SDK through callsites. set() throws on a
+ // second call; wrap defensively.
+ result.foreach { sdk =>
+ Try(GlobalOpenTelemetry.set(sdk)).failed.foreach { t =>
+ logger.warn(
+ s"GlobalOpenTelemetry already set; using the existing instance:
${t.getMessage}"
+ )
+ }
+ }
+ result
+ }
+
+ /**
+ * Test-only entry point: injects an env-var map and exporters so the
+ * SDK makes no network connection. Does not attach the Logback appender.
+ */
+ private[observability] def initForTest(
+ serviceName: String,
+ envOverride: Map[String, String],
+ exporter: SpanExporter,
+ metricExporter: Option[MetricExporter] = None
+ ): Option[OpenTelemetry] =
+ synchronized {
+ initInternal(
+ serviceName = serviceName,
+ envProvider = envOverride.get,
+ spanExporterFactory = _ => exporter,
+ logExporterFactory = _ => None,
+ metricExporterFactory = _ => metricExporter,
+ logbackAttacher = (_, _) => () // no-op in tests
+ )
+ }
+
+ /** Test-only: forget any previously-installed SDK. Does not unregister
+ * shutdown hooks (the previous SDK is closed instead).
+ */
+ private[observability] def resetForTest(): Unit =
+ synchronized {
+ initialized.foreach {
+ case sdk: OpenTelemetrySdk =>
+ Try(sdk.getSdkTracerProvider.close())
+ Try(sdk.getSdkLoggerProvider.close())
+ Try(sdk.getSdkMeterProvider.close())
+ case _ => ()
+ }
+ initialized = None
+ }
+
+ private def initInternal(
+ serviceName: String,
+ envProvider: String => Option[String],
+ spanExporterFactory: String => SpanExporter,
+ logExporterFactory: String => Option[LogRecordExporter],
+ metricExporterFactory: String => Option[MetricExporter],
+ logbackAttacher: (String, OpenTelemetry) => Unit
+ ): Option[OpenTelemetry] = {
+ if (initialized.isDefined) return initialized
+
+ // Disabled by default (issue #5367): stay inert unless OTEL_SDK_DISABLED
is
+ // explicitly false. An unreachable endpoint drops records without
crashing.
+ val disabled =
envProvider(EnvironmentalVariable.ENV_OTEL_SDK_DISABLED).getOrElse("true")
+ if (!disabled.equalsIgnoreCase("false")) {
+ logger.info(
+ "OpenTelemetry SDK disabled (OTEL_SDK_DISABLED not false). No
telemetry will be emitted."
+ )
+ return None
+ }
+
+ val endpoint =
+
envProvider(EnvironmentalVariable.ENV_OTEL_EXPORTER_OTLP_ENDPOINT).getOrElse(DefaultEndpoint)
+ val extraAllowed =
envProvider(EnvironmentalVariable.ENV_TEXERA_OTEL_ALLOWED_HOSTS)
+
.map(_.split(',').iterator.map(_.trim.toLowerCase).filter(_.nonEmpty).toSet)
+ .getOrElse(Set.empty)
+ val allowedHosts = DefaultAllowedHosts ++ extraAllowed
+
+ validateEndpoint(endpoint, allowedHosts) match {
+ case Left(reason) =>
+ // One WARN; no telemetry is emitted.
+ logger.warn(
+ s"OpenTelemetry SDK disabled: invalid OTEL_EXPORTER_OTLP_ENDPOINT —
$reason. " +
+ "Set TEXERA_OTEL_ALLOWED_HOSTS to extend the allowlist."
+ )
+ return None
+ case Right(_) => // ok
+ }
+
+ val rawAttrs =
envProvider(EnvironmentalVariable.ENV_OTEL_RESOURCE_ATTRIBUTES).getOrElse("")
+ val resource = buildResource(serviceName, rawAttrs)
+
+ val spanExporter = spanExporterFactory(endpoint)
+ val tracerProvider = SdkTracerProvider
+ .builder()
+ .setResource(resource)
+ .addSpanProcessor(BatchSpanProcessor.builder(spanExporter).build())
+ .build()
+
+ val sdkBuilder =
OpenTelemetrySdk.builder().setTracerProvider(tracerProvider)
+
+ // Logger provider is optional; the factory returns None in tests.
+ val loggerProviderOpt = logExporterFactory(endpoint).map { logExporter =>
+ val lp = SdkLoggerProvider
+ .builder()
+ .setResource(resource)
+
.addLogRecordProcessor(BatchLogRecordProcessor.builder(logExporter).build())
+ .build()
+ sdkBuilder.setLoggerProvider(lp)
+ lp
+ }
+
+ // Meter provider is optional too; interval falls back to the default
+ // when out of range.
+ val intervalMs =
+
clampIntervalMs(envProvider(EnvironmentalVariable.ENV_OTEL_METRIC_EXPORT_INTERVAL))
+ val meterProviderOpt = metricExporterFactory(endpoint).map {
metricExporter =>
+ val reader = PeriodicMetricReader
+ .builder(metricExporter)
+ .setInterval(Duration.ofMillis(intervalMs))
+ .build()
+ val mp = SdkMeterProvider
+ .builder()
+ .setResource(resource)
+ .registerMetricReader(reader)
+ .build()
+ sdkBuilder.setMeterProvider(mp)
+ mp
+ }
+
+ val sdk = sdkBuilder.build()
+
+ // One startup span carrying only service.name.
+ val span =
sdk.getTracer("texera.bootstrap").spanBuilder("service.start").startSpan()
+ Try(span.setAttribute("service.name", serviceName))
+ span.end()
+
+ // Wire the Logback appender; failure here must not crash the service.
+ Try(logbackAttacher(serviceName, sdk)).failed.foreach { t =>
+ logger.warn(s"Failed to attach OTel Logback appender (logs not
exported): ${t.getMessage}")
+ }
+
+ // Flush providers on shutdown. Added after the SDK is fully built.
+ Runtime.getRuntime.addShutdownHook(
+ new Thread(
+ () => {
+ Try(tracerProvider.close())
+ loggerProviderOpt.foreach(lp => Try(lp.close()))
+ meterProviderOpt.foreach(mp => Try(mp.close()))
+ ()
+ },
+ "otel-shutdown"
+ )
+ )
+
+ initialized = Some(sdk)
+ logger.info(s"OpenTelemetry SDK initialized for service '$serviceName'
(endpoint=$endpoint).")
+ initialized
+ }
+
+ /**
+ * Validate the endpoint is parseable and uses an allowlisted scheme
+ * and host. Pure function.
+ */
+ private[observability] def validateEndpoint(
+ endpoint: String,
+ allowedHosts: Set[String]
+ ): Either[String, Unit] = {
+ Try(URI.create(endpoint)) match {
+ case Failure(e) =>
+ Left(s"unparseable URI (${e.getClass.getSimpleName})")
+ case Success(uri) =>
+ val scheme = Option(uri.getScheme).map(_.toLowerCase).getOrElse("")
+ if (scheme.isEmpty) {
+ Left("missing scheme")
+ } else if (!AllowedSchemes.contains(scheme)) {
+ Left(
+ s"scheme '$scheme' not in allowlist
${AllowedSchemes.toSeq.sorted.mkString("{", ",", "}")}"
+ )
+ } else {
+ val host = Option(uri.getHost).map(_.toLowerCase).getOrElse("")
+ if (host.isEmpty) {
+ Left("missing host")
+ } else if (!allowedHosts.contains(host)) {
+ Left(s"host '$host' not in allowlist")
+ } else {
+ Right(())
+ }
+ }
+ }
+ }
+
+ /**
+ * Build a Resource from the service name and OTEL_RESOURCE_ATTRIBUTES.
+ * Every parsed attribute is applied so new resource fields need no edit
+ * here; the one exception is service.name, which the argument controls
+ * and env cannot override.
+ */
+ private[observability] def buildResource(serviceName: String, rawAttrs:
String): Resource = {
+ val builder = Attributes.builder()
+ builder.put(AttributeKey.stringKey("service.name"), serviceName)
+
+ parseAttrs(rawAttrs).foreach {
+ case (key, value) if key != "service.name" =>
+ builder.put(AttributeKey.stringKey(key), value)
+ case _ => // env cannot override service.name
+ }
+
+ Resource.create(builder.build())
+ }
+
+ /** Parse a `k1=v1,k2=v2` string. Malformed entries are skipped. */
+ private[observability] def parseAttrs(raw: String): Seq[(String, String)] = {
+ if (raw == null || raw.isEmpty) return Seq.empty
+ raw
+ .split(',')
+ .iterator
+ .map(_.trim)
+ .filter(_.nonEmpty)
+ .flatMap { entry =>
+ val idx = entry.indexOf('=')
+ if (idx <= 0 || idx == entry.length - 1) None
+ else Some(entry.substring(0, idx).trim -> entry.substring(idx +
1).trim)
+ }
+ .toSeq
+ }
+
+ private def buildOtlpSpanExporter(endpoint: String): SpanExporter =
+ OtlpGrpcSpanExporter.builder().setEndpoint(endpoint).build()
+
+ private def buildOtlpLogExporter(endpoint: String): LogRecordExporter =
+ OtlpGrpcLogRecordExporter.builder().setEndpoint(endpoint).build()
+
+ private def buildOtlpMetricExporter(endpoint: String): MetricExporter =
+ OtlpGrpcMetricExporter.builder().setEndpoint(endpoint).build()
+
+ /**
+ * Parse and clamp OTEL_METRIC_EXPORT_INTERVAL (ms). Out-of-range or
+ * unparseable input falls back to the default with one WARN.
+ */
+ private[observability] def clampIntervalMs(raw: Option[String]): Long = {
Review Comment:
No test reaches this method. All four outcomes — absent, unparseable,
out-of-range, in-range — are unexercised: grep across
`common/observability/src/test` finds zero references to `clampIntervalMs` or
its three bounds constants.
Those constants are `private[observability]`, and test access is the only
reason to widen them, so the visibility reads as prepared for tests that never
landed. The description also lists "interval fallback" among `OtelInitSpec`'s
coverage. This is the only new branching logic here without a guard.
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