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https://issues.apache.org/jira/browse/SPARK-38409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17523401#comment-17523401
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Apache Spark commented on SPARK-38409:
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User 'jkylling' has created a pull request for this issue:
https://github.com/apache/spark/pull/36234
> 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
> Priority: Major
>
> [PrometheusServlet|#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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