zentol opened a new pull request #9503: [FLINK-13806][metrics] Log all errors on DEBUG URL: https://github.com/apache/flink/pull/9503 This PR sets the log level of all messages in the `MetricFetcher` to debug. Errors in the MetricFetcher are mostly due the connection with a TaskExecutor breaking down, which are logged in a more appropriate way elsewhere (relevant: FLINK-13805). Additionally, the MetricFetcher is one of those components which does not crash when running into exceptions, and thus should special care on what it logs, as any message will likely be logged several times.
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