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#alerting

3 posts

SRE & DevOpsDeep Dive October 3, 2026 6 min read

Prometheus Alert Rules: Evaluation, Pending State, and Notification Boundaries

Understand Prometheus rule-group timing, `for`, `keep_firing_for`, alert identity, missing data, and the separate Alertmanager delivery path.

#prometheus#alerting#promql

SRE & DevOpsDeep Dive October 3, 2026 10 min read

Alertmanager High Availability: Peering, Deduplication, and Delivery

Build reliable Alertmanager HA with direct Prometheus fan-out, a healthy peer mesh, stable alert identity, tested routing, and realistic delivery guarantees.

#prometheus#alertmanager#alerting

SRE & DevOpsDeep Dive October 3, 2026 8 min read

Prometheus Rule Tests: promtool Fixtures and Alert Coverage

Test PromQL and alert-rule behavior deterministically with promtool, including pending intervals, labels, missing series, group order, and CI validation.

#prometheus#promql#alerting