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TargetDown
Meaning
The alert means that one or more prometheus scrape targets are down. It fires when at least 10% of scrape targets in a Service are unreachable.
Impact
Metrics from a particular target cannot be scraped as such there is no data for this target in Prometheus and alerting can be hindered.
Diagnosis
/targets page in Prometheus UI can be used to check the scrape error for the particular target.
up == 0 query can be used to check the trend over time.
Mitigation
Mitigation depends on the error reported by prometheus and there is no generic one.