yuecong commented on issue #26060: [SPARK-29400][CORE] Improve PrometheusResource to use labels URL: https://github.com/apache/spark/pull/26060#issuecomment-539809234 > 1. Please see this PR's description. The metric name is **unique** with cadinality 1 by using labels, `metrics_executor_rddBlocks_Count{application_id="app-20191008151625-0000"` For Prometheus, not just the metrics name, but also labels count for a high-cardinality. Inside the tsdb for Prometheus server, actually, the combination of metrics names and labels are the key. see details [here](https://prometheus.io/docs/practices/naming/#labels) > CAUTION: Remember that every unique combination of key-value label pairs represents a new time series, which can dramatically increase the amount of data stored. Do not use labels to store dimensions with high cardinality (many different label values), such as user IDs, email addresses, or other unbounded sets of values.
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