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by RGJorge
38 days ago
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The "easy to set up" framing usually skips the hardest part: whether the metric you're alerting on is meaningful. Most stacks pull container memory from cAdvisor's `container_memory_usage_bytes`, which is the
same broken `memory_stats.usage` that `docker stats` reports — includes the kernel's reclaimable page cache. For DB containers with hot working sets, that metric stays at 95%+ constantly. Beautiful Grafana
dashboards alerting on a structurally wrong number. The fix is computing real anonymous memory (subtract active_file + inactive_file) — most stacks leave that as a custom exporter exercise. Curious how Traceway handles this out of the box. |
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