2022-02-03: Firing 2 - LoggingVisibilityDiminished
Incident DRI
Current Status
An increase in the rails logs following Feb 3rd morning deployments has caused a growing backlog of unacknowledged messages, we increased the logging beats capacity as a short-term mitigation to process the backlog, with the help of the team, the change suspected to cause the increase was identified and an MR to mitigate the increase in log volume has been added to the merge train.
We should be able to confirm around , the deployment confirmed to have mitigated the root cause of this incident Feb 4th, 15:00 UTC
if the issue has subsided
Summary for CMOC notice / Exec summary:
- Customer Impact: No user impact.
- Service Impact: ServiceLogging
Timeline
Recent Events (available internally only):
- Deployments
- Feature Flag Changes
- Infrastructure Configurations
- GCP Events (e.g. host failure)
All times UTC.
2022-02-03
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14:41
- Alert pagedFiring 1 - PubSub queuing high
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14:56
- Alert firedFiring 2 - LoggingVisibilityDiminished
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15:02
- @rehab declares incident in Slack. -
16:15
- logging MR merged. -
19:56
- MR reducing the logs volume added to merge train.
Takeaways
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Corrective Actions
Corrective actions should be put here as soon as an incident is mitigated, ensure that all corrective actions mentioned in the notes below are included.
- Increase the beats fleet to accommodate increased bandwidth of the rails log stream gitlab-com/gl-infra/k8s-workloads/gitlab-helmfiles!559 (merged)
- Silence deprecation warning. gitlab-org/gitlab!79885 (merged)
- Docs: Logging visibility and deprecations gitlab-org/gitlab!79944 (merged)
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Incident Review
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If there are any corrective action items mentioned in the notes on the incident, ensure they are listed in the "Corrective Action" section -
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Customer Impact
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Who was impacted by this incident? (i.e. external customers, internal customers)
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What was the customer experience during the incident? (i.e. preventing them from doing X, incorrect display of Y, ...)
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How many customers were affected?
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If a precise customer impact number is unknown, what is the estimated impact (number and ratio of failed requests, amount of traffic drop, ...)?
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What were the root causes?
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Incident Response Analysis
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How was the incident detected?
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How could detection time be improved?
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How was the root cause diagnosed?
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How could time to diagnosis be improved?
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How did we reach the point where we knew how to mitigate the impact?
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How could time to mitigation be improved?
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What went well?
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Post Incident Analysis
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Did we have other events in the past with the same root cause?
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Do we have existing backlog items that would've prevented or greatly reduced the impact of this incident?
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Was this incident triggered by a change (deployment of code or change to infrastructure)? If yes, link the issue.
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What went well?
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Guidelines
Resources
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