High response time detected; slot swap executed – sreproactive-vscode-39596

[gderossilive]

Summary:

• Alert: sreproactive-plan-cpu-high (Sev2) on App Service plan
• App: sreproactive-vscode-39596
• Current avg response time (pre-swap, last 5m @ 2026-05-12T23:42:34Z): 39.03535 ms
• Baseline (from baseline.txt @ 2026-05-12T09:30:58.5126352Z): 31.18436111111111 ms
• Deviation: +25.17% (>=20%)
• Action taken: Slot swap executed (staging -> production)
• Swap time (UTC): 2026-05-12T23:46:54.106000+00:00
• Post-swap avg response time (2026-05-12T23:46:54Z..23:48:00Z): 739.7378 ms (regressed)

Evidence:

• Health endpoints:
  • Production: https://sreproactive-vscode-39596.azurewebsites.net/health
  • Staging: https://sreproactive-vscode-39596-staging.azurewebsites.net/health
• App Insights KQL (pre-swap window):

let startTime=datetime(2026-05-12T23:37:34Z);
let endTime=datetime(2026-05-12T23:42:34Z);
requests
| where timestamp >= startTime and timestamp <= endTime
| where cloud_RoleName <> '' and not(cloud_RoleName contains "staging")
| summarize CurrentResponseTime = avg(duration) by cloud_RoleName
| extend CurrentTimestamp = endTime

• App Insights KQL (post-swap window):

let startTime=datetime(2026-05-12T23:46:54Z);
let endTime=datetime(2026-05-12T23:48:00Z);
requests
| where timestamp >= startTime and timestamp <= endTime
| where cloud_RoleName <> '' and not(cloud_RoleName contains "staging")
| summarize CurrentResponseTime = avg(duration) by cloud_RoleName
| extend CurrentTimestamp = endTime

• Baseline source: baseline.txt with BaselineResponseTime=31.18436111111111; BaselineTimestamp=2026-05-12T09:30:58.5126352Z
• Artifacts: response_time_evidence_20260512T234843Z.png, response_time_evidence_20260512T234843Z.csv (generated during investigation)

Request:

• Investigate regression post swap. Potential causes: code/config performance issues in newly promoted slot, startup warmup delay, dependency latency.
• Provide remediation plan and consider rollback if persistent.

Context:

• Resource group: rg-sre-proactive-demo, Subscription: 06dbbc7b-2363-4dd4-9803-95d07f1a8d3e
• Web App: sreproactive-vscode-39596
• AI resource: sreproactive-vscode-39596-ai

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This issue was created by sre-agent-proactive-demo--73aee8f4
Tracked by the SRE agent here