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PASSEDinfrastructure / datadog_agent_mass_disconnect
Datadog Agent Mass Disconnect — Fleet Monitoring Gap
A Datadog API key rotation was performed incorrectly, deploying the new key to only 30 of 500 servers. The remaining 470 agents are now sending data with the revoked API key, resulting in silent data loss. Datadog shows green dashboards but only from 30 servers.
Pattern
SERVER_ERROR
Severity
CRITICAL
Confidence
95%
Remediation
Auto-Heal
Test Results
| Metric | Expected | Actual | Result |
|---|---|---|---|
| Pattern Recognition | SERVER_ERROR | SERVER_ERROR | |
| Severity Assessment | CRITICAL | CRITICAL | |
| Incident Correlation | Yes | 18 linked | |
| Cascade Escalation | N/A | No | |
| Remediation | — | Auto-Heal — Corax resolves autonomously |
Scenario Conditions
500 servers with Datadog agent. API key rotated. New key deployed to 30 servers only. 470 agents using revoked key. Datadog rejecting data silently (no agent-side error). Dashboards appear healthy but data from 94% of fleet is missing.
Injected Error Messages (2)
Datadog agent connectivity audit CRITICAL — 470 of 500 monitored servers not reporting metrics to Datadog, agent fleet health: 6% reporting (30/500), API key rotation on 2026-03-28 only applied to 30 servers via Ansible (playbook limited to 'webservers' group, missing 'dbservers', 'appservers', 'batch' groups), 470 agents silently failing with revoked API key, Datadog API returning 403 for old key but agents not surfacing error prominently in local logs
Datadog fleet dashboard showing misleading data — dashboards appear green but represent only 30 of 500 servers, host map shows 470 hosts as 'not reporting', infrastructure metrics coverage: 6%, APM traces from 470 servers not arriving, log ingestion from 470 servers dropped to zero, alerts based on aggregate metrics are meaningless with 94% of fleet unreported, effective monitoring coverage: critically insufficient
Neural Engine Root Cause Analysis
This is not a Datadog API endpoint failure, but rather a configuration management issue caused by incomplete API key rotation. On 2026-03-28, a new Datadog API key was deployed via Ansible, but the playbook was limited to only the 'webservers' group (30 servers), missing the 'dbservers', 'appservers', and 'batch' groups (470 servers). The 470 affected servers are now using revoked API keys, causing 403 authentication failures when attempting to send metrics to Datadog, resulting in a 94% agent fleet failure rate.
Remediation Plan
1. Immediately identify the new valid Datadog API key from the successful 30 servers or configuration management system. 2. Update Ansible playbook to target all server groups: 'webservers', 'dbservers', 'appservers', and 'batch'. 3. Deploy the correct API key to all 470 affected servers using the expanded Ansible playbook. 4. Restart Datadog agents on affected servers to establish connectivity with new API key. 5. Monitor agent connectivity to verify all 500 servers are reporting metrics. 6. Implement process improvements to ensure future API key rotations include all server groups.
Tested: 2026-03-30Monitors: 2 | Incidents: 2Test ID: cmnckgopf09dmobqeuqj68k4o