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#monitoring
2 posts
Systems debugging
9 min
VictoriaMetrics already had downsampling, under another name
Downsampling is an enterprise feature in VictoriaMetrics. The open-source binary already keeps the last sample per interval during merges and calls it deduplication. Make the interval depend on the sample's age and you have tiers. The patch is 213 lines and has applied cleanly to five releases.
#victoriametrics#prometheus#monitoring#go
Systems debugging
4 min
The load average with a seven hour heartbeat
Every seven hours the router's load average hit 1.0 for forty five minutes. CPU was 98% idle. Nothing ran, nothing blocked, nothing was stolen. The culprit was a beat frequency between two five second clocks, and one of them was mine.
#linux#kernel#monitoring#grafana