Project autocomplete members/commands NoMethodError

Summary

In production incident gitlab-com/gl-infra/production#7820 (closed), canary environment triggered an alert for elevated error ratio.

This was generated by calls to /-/autocomplete_sources/members and /-/autocomplete_sources/commands which resulted in 500 errors.

• Logs https://log.gprd.gitlab.net/goto/b9e37e40-414b-11ed-b0ec-930003e0679c
• Sentry https://sentry.gitlab.net/gitlab/gitlabcom/issues/3319713/?query=is%3Aunresolved%20NoMethodError

Impact

Elevated number of 500 errors, resulting in monitoring alerts.

Recommendation

Investigate calls to the followings methods:

Projects::AutocompleteSourcesController#commands
Projects::AutocompleteSourcesController#members

The endpoint shouldn't return 500 errors on missing attributes or lack of session.

Verification