Process logs before sending them to loki #1243
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| Original file line number | Diff line number | Diff line change |
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@@ -25,11 +25,31 @@ transforms: | |
| .message = .short_message | ||
| } | ||
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| # Extract structured log fields from message using regex pattern | ||
| if exists(.message) { | ||
| parsed_fields, err = parse_regex(.message, r'log_level=(?P<log_level>[^|]*) \| log_timestamp=(?P<log_timestamp>[^|]*) \| log_source=(?P<log_source>[^|]*) \| log_uid=(?P<log_uid>[^|]*) \| log_oec=(?P<log_oec>[^|]*) \| log_trace_id=(?P<log_trace_id>[^|]*) \| log_span_id=(?P<log_span_id>[^|]*) \| log_msg=(?P<log_msg>.*)$') | ||
| if err == null { | ||
| .log_level = parsed_fields.log_level | ||
| .log_timestamp = parsed_fields.log_timestamp | ||
| .log_source = parsed_fields.log_source | ||
| .log_uid = parsed_fields.log_uid | ||
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There was a problem hiding this comment. Does this becomes a label in There was a problem hiding this comment. They are not labels, because labels should have low cardinality (https://grafana.com/docs/loki/latest/get-started/labels/bp-labels/). Instead this adds them as keys in the log json. Then there is a json parser directly in loki and after applying that one can filter on these fields. 
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| .log_oec = parsed_fields.log_oec | ||
| .log_trace_id = parsed_fields.log_trace_id | ||
| .log_span_id = parsed_fields.log_span_id | ||
| .log_msg = parsed_fields.log_msg | ||
| } | ||
| } | ||
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| # Handle container name - GELF uses _container_name (with underscore prefix) | ||
| if exists(._container_name) { | ||
| .container_name = ._container_name | ||
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| # Extract Docker service name from container name (everything before first dot) | ||
| match = parse_regex!(.container_name, r'^(?P<service_name>[^.]+)') | ||
| .service_name = match.service_name | ||
| } else { | ||
| .container_name = "unknown" | ||
| .service_name = "unknown" | ||
| } | ||
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| # Handle container ID | ||
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@@ -58,13 +78,13 @@ sinks: | |
| encoding: | ||
| codec: json | ||
| labels: | ||
| source: "vector" | ||
| host: "{{ host }}" | ||
| container_name: "{{ container_name }}" | ||
| service_name: "{{ service_name }}" | ||
| # Override level label with extracted log_level from structured logs. This ensures correct color coding in Loki/Grafana | ||
| level: "{{ log_level }}" | ||
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| healthcheck: | ||
| enabled: true | ||
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Probably this won't parse traefik logs.
We did fix this in Graylog #293
Might be interesting if you want to include traefik log level