Jonas created SPARK-38409:
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Summary: PrometheusServlet exports gauges with null values
Key: SPARK-38409
URL: https://issues.apache.org/jira/browse/SPARK-38409
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 3.2.1
Reporter: Jonas
[PrometheusServlet](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/metrics/sink/PrometheusServlet.scala#L63)
exports gauges with value null as `gauge_name{} null`. This can for instance
happen if one initializes a
[DefaultSettableGauge](https://www.javadoc.io/static/io.dropwizard.metrics/metrics-core/4.2.0-beta.3/com/codahale/metrics/DefaultSettableGauge.html)
without a default value. Null values are not scraped by Prometheus as null is
not a valid floating point value. A null value prevents any metrics from being
scraped and the endpoint will be considered to be down by Prometheus.
A solution could be to omit listing the gauge if its value is null.
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