Two cardinality/volume cuts to keep Prometheus storage sustainable
within the size budget:
- scrape_interval 5s -> 20s (evaluation_interval too). 5s tripled the
sample volume vs the 15s default for no benefit on a single-box
deployment; all rules use [5m] windows and for: >= 1m.
- Drop high-cardinality cAdvisor families we never chart or alert on
(container_fs_*, blkio_*, tasks_state, memory_failures_total,
memory_numa_*, network_tcp*/udp*) on both cadvisor jobs. Dashboards
only use container CPU, memory, and start_time. This was the bulk of
the ~12.4k active series.
Validated with `promtool check config`.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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