Loki.md

Debugging

curl localhost:3100/config      # Dump active config

Log Query Examples

Convert log string to json

{label="match"} | json

Reduce log lines to exception names

{label="match"} |~ "Exception:" | json | regex(.message, '.*\\s+(\\S*Exception):')

Reduce log lines to exception names (without regex for Loki <2.4)

{label="match"} |~ "Exception:" | json | line_format `{{ regexReplaceAll ".*\\s+(\\S*Exception):.*$" .message "${1}" }}`

Extract a text part into a label for example exceptions:

{kubernetes_namespace_name="my-namespace-1"}
|= `Exception:`
| regexp "(?P<exception>\\w+Exception: [^\"]+)"
| label_format exception=`{{ .exception }}`