Silence an alert prometheus
Create an Alertmanager silence for 2 hours
amtool silence add alertname=HighMemory --duration=2h --comment='Investigating'
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Check TSDB status
curl -s http://prometheus:9090/api/v1/status/tsdb | jq '{head_chunks: .data.headStats.numChunks, series: .data.headStats.numSeries}'
95th percentile latency from histogram
histogram_quantile(0.95, sum by(le,job)(rate(http_request_duration_seconds_bucket[5m])))
Predict disk full window
predict_linear(node_filesystem_avail_bytes{mountpoint="/"}[6h], 4*3600) < 0
Detect dead target with absent
absent(up{job="node"} == 1)
Rewrite label with label_replace
label_replace(node_uname_info, "host", "$1", "nodename", "(.+)")