dsmiley commented on code in PR #3413:
URL: https://github.com/apache/solr/pull/3413#discussion_r2217971651


##########
solr/core/src/java/org/apache/solr/metrics/otel/OtlpExporterFactory.java:
##########
@@ -0,0 +1,65 @@
+/*
+ * 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.solr.metrics.otel;
+
+import io.opentelemetry.exporter.otlp.http.metrics.OtlpHttpMetricExporter;
+import io.opentelemetry.exporter.otlp.metrics.OtlpGrpcMetricExporter;
+import io.opentelemetry.sdk.metrics.export.MetricExporter;
+import java.lang.invoke.MethodHandles;
+import org.apache.solr.common.util.EnvUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Factory class for creating OpenTelemetry OTLP metric exporters and its 
configuration properties.
+ *
+ * @see io.opentelemetry.exporter.otlp.http.metrics.OtlpHttpMetricExporter
+ * @see io.opentelemetry.exporter.otlp.metrics.OtlpGrpcMetricExporter
+ * @see NoopMetricExporter
+ */
+public class OtlpExporterFactory {
+
+  private static final Logger log = 
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
+  public static final Boolean OTLP_EXPORTER_ENABLED =
+      
Boolean.parseBoolean(EnvUtils.getProperty("solr.otlpMetricExporterEnabled", 
"false"));
+
+  public static final String OTLP_EXPORTER_PROTOCOL =
+      EnvUtils.getProperty("solr.otlpMetricExporterProtocol", "grpc");
+
+  public static final int OTLP_EXPORTER_INTERVAL =
+      Integer.parseInt(EnvUtils.getProperty("solr.otlpMetricExporterInterval", 
"60000"));

Review Comment:
   Use of EnvUtils should have a format of "solr.module.blahBlah", so you have 
a missing period after "otlp".  Although the module should be more major like 
"metrics"



##########
solr/core/src/java/org/apache/solr/metrics/otel/OtlpExporterFactory.java:
##########
@@ -0,0 +1,65 @@
+/*
+ * 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.solr.metrics.otel;
+
+import io.opentelemetry.exporter.otlp.http.metrics.OtlpHttpMetricExporter;
+import io.opentelemetry.exporter.otlp.metrics.OtlpGrpcMetricExporter;
+import io.opentelemetry.sdk.metrics.export.MetricExporter;
+import java.lang.invoke.MethodHandles;
+import org.apache.solr.common.util.EnvUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Factory class for creating OpenTelemetry OTLP metric exporters and its 
configuration properties.
+ *
+ * @see io.opentelemetry.exporter.otlp.http.metrics.OtlpHttpMetricExporter
+ * @see io.opentelemetry.exporter.otlp.metrics.OtlpGrpcMetricExporter
+ * @see NoopMetricExporter
+ */
+public class OtlpExporterFactory {

Review Comment:
   I agree; metrics exporting belongs in a module.  Rationale:  to constrain 
dependencies



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