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You have a Prometheus alerting rule that triggers too frequently during flapping states. Which feature should you use to prevent this without silencing the alert entirely?
The 'for' field in a Prometheus alerting rule specifies how long the condition must be true before the alert fires. By setting a duration (e.g., '5m'), it prevents alerts from triggering during brief flapping states, as the condition must persist for that period. This reduces noi…Read full explanation
You have a recording rule named 'job:node_cpu:avg_rate_5m'. Where is this metric stored once the rule is executed?
Recording rules in Prometheus evaluate a PromQL expression on a schedule and write the resulting samples back into the Prometheus TSDB as new time series. The metric 'job:node_cpu:avg_rate_5m' is therefore stored in the same local TSDB as scraped metrics, queryable via PromQL lik…Read full explanation
When configuring Alertmanager 'group_by' settings, what happens if you include a label that is not present on an incoming alert?
Alertmanager's group_by directive groups alerts by the values of the specified labels. If a label listed in group_by is absent from an incoming alert, Alertmanager treats its value as empty/null and still groups the alert under that null value rather than dropping or erroring. Th…Read full explanation
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