Companies/Lightstep (ServiceNow Cloud Observability)/Incidents

Lightstep (ServiceNow Cloud Observability): Lightstep Webapp Down

Affected components: US - DashboardsWeb UI - DashboardsUS - Service DirectoryWeb UI - Service DirectoryWeb UI - LoginUS - ExplorerWeb UI - ExplorerUS - Change IntelligenceWeb UI - Root Cause Analysis

Timeline of updates

1. investigating2022-01-20 17:58 UTC

   We are currently investigating this issue.

2. investigating2022-01-20 18:41 UTC

   All pages are operational except for the streams page. We are continuing to investigate.

3. monitoring2022-01-20 20:08 UTC

   A fix for the remaining unavailability on the streams page is rolling out, and is expected to complete by 1pm PST.

4. monitoring2022-01-20 21:21 UTC

   We are continuing to monitor for any further issues.

5. resolved2022-01-20 21:21 UTC

   This incident has been resolved.

6. postmortem2022-02-01 23:14 UTC

   ## **Summary** Web UI inaccessible for 48 minutes \(9:49am - 10:37am\), and streams page inaccessible for an additional 48 minutes \(until 11:25am\). ## **Timeline \(12-hour Pacific Time\)** 09:49 AM PT: 100% of API requests for the webapp begin failing 09:52 AM PT: Database hits 100% resource utilization 10:31 AM PT: Divert all traffic from webapp to bring up database 10:37 AM PT: Allow all traffic except from the operation/get endpoint so the webapp is back up 11:25 AM PT: Allow operation/get traffic and incident is resolved ## **Root Cause** Database errors led to transient unavailability.  Aggressive retries saturated the database, leading to a negative feedback loop. ## **Action items** We have updated our database configuration to limit the blast radius of failing or slow database calls.  We have also implemented additional rate limiting to avoid the negative feedback loop where many concurrent requests lead to failures, leading to more requests.

Changes Rewindex caught on this incident

• Jan 20, 2022Critical incident: Lightstep Webapp Down

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab).

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