https://logstash.wikimedia.org/app/dashboards#/view/mediawiki-errors has a filter for error channels.
| Field | Value |
|---|---|
| type | mediawiki |
| channel.keyword | exception error jsonTruncated |
That excludes ERROR level messages from other channels and exceptions which are in the exception channel but otherwise lack a level. The dashboard thus reflects a partial view of all errors.
I found that out a fairly recently and removing the current filter is how I caught ExtensionDistributor throwing errors (T340483). The reported issue had:
| Field | Value |
|---|---|
| channel | ExtensionDistributor |
| level | ERROR |
| type | mediawiki |
A filter letting any ERROR (regardless of channel) and any message to the exception channel (regardless of level) would have shown the issue.