How does Alertmanager relate to Prometheus, and what does it add?
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Quick Answer
Prometheus evaluates alerting rules and fires to Alertmanager, which handles grouping, deduplication, silencing, inhibition, and routing.
Detailed Answer
Prometheus only decides when an alert is firing; Alertmanager decides what to do with it — group related alerts into one notification, dedupe across replicas, silence during maintenance, inhibit lower-severity alerts when a higher one fires, and route by label to Slack/PagerDuty/email.
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Interview Tip
List grouping, dedup, silence, inhibit, route.
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