loki
7 commands
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Parse JSON logs and reshape line
Filter by substring, parse JSON, render only chosen fields. note: | json before line_format.
{app="api"} |= "error" | json | line_format "{{.level}} {{.msg}}"
Per-level log rate
Logs/sec grouped by level over 5m window. modern: logfmt parser for key=value lines.
sum by (level) (rate({app="api"} | logfmt [5m]))
Quantile over unwrapped latency
p99 latency from a numeric log field per route. note: unwrap needs a numeric label/field.
quantile_over_time(0.99, {app="api"} | json | unwrap latency_ms [5m]) by (route)
Count matching lines over time
Count regex-matched error lines per minute across a namespace. |~ is regex match.
sum(count_over_time({namespace="prod"} |~ "timeout|deadline exceeded" [1m]))
logcli ad-hoc query
CLI query for last hour with line cap and JSONL output. set LOKI_ADDR env first.
logcli query '{job="app/api"} |= "panic"' --since=1h --limit=200 --output=jsonl
Loki query_range via API
Run a range metric query over HTTP and extract result with jq. step is in seconds.
curl -sG "$LOKI_ADDR/loki/api/v1/query_range" --data-urlencode 'query=sum(rate({app="api"}[5m]))' --data-urlencode 'step=60' | jq '.data.result'
Push log lines to Loki
Manually push a log entry to verify ingestion. note: timestamp must be ns epoch.
curl -s -H 'Content-Type: application/json' -XPOST "$LOKI_ADDR/loki/api/v1/push" -d '{"streams":[{"stream":{"app":"test"},"values":[["'$(date +%s%N)'","hello loki"]]}]}'
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