Hi,
This is a heads up about a breaking change to mediawiki/services/servicelib-golang https://gerrit.wikimedia.org/r/admin/repos/mediawiki/services/servicelib-golang,general. If you don't maintain a service written in Go that uses this library, you can safely ignore this message.
The logger that ships in mediawiki/services/servicelib-golang https://gerrit.wikimedia.org/r/admin/repos/mediawiki/services/servicelib-golang,general is meant to utilize Elastic Common Schema (ECS) https://doc.wikimedia.org/ecs/, but is missing a required attribute, ecs.version. Without that version string, log messages aren't handled as ECS events, they are processed and stored in the legacy manner.
Any existing projects that upgrade to the latest version of the logger ( v1.0.0) will need to update any dashboards or saved searches to use the ecs-* index pattern (instead of logstash-*).
https://phabricator.wikimedia.org/T383371 https://gerrit.wikimedia.org/r/c/mediawiki/services/servicelib-golang/+/1109...
Please reach out if you have any questions, or need any help with this.
Thanks,