Series cardinality per job

PromQL: count active time series grouped by job label

count by (job) ({__name__=~".+"})
tool
prometheus30 commands
tags
prometheusmonitoring

More prometheus commands

  • Silence an alert
    amtool silence add alertname=HighMemory --duration=2h --comment='Investigating'

    Create an Alertmanager silence for 2 hours

  • Check TSDB status
    curl -s http://prometheus:9090/api/v1/status/tsdb | jq '{head_chunks: .data.headStats.numChunks, series: .data.headStats.numSeries}'

    View TSDB head stats: chunks and active series

  • 95th percentile latency from histogram
    histogram_quantile(0.95, sum by(le,job)(rate(http_request_duration_seconds_bucket[5m])))

    p95 latency per job; note: always aggregate _bucket by le before histogram_quantile

  • Predict disk full window
    predict_linear(node_filesystem_avail_bytes{mountpoint="/"}[6h], 4*3600) < 0

    alert when linear trend predicts disk full within 4h based on last 6h

  • Detect dead target with absent
    absent(up{job="node"} == 1)

    fires when no series match; catches a job that vanished from discovery entirely

all 30 prometheus commands