Break/Fix: Broken Dashboard Query

Scenario

You are operating a production observability platform. The following symptoms appear:

• Panel shows “No data” or error

Available evidence:

• Other panels on the same data source work

Your task

Determine the cause, recover, document, and validate.

Investigation

The investigation follows the discipline taught in Part XCVIII:

1. Form hypothesis, find evidence, test, validate.
2. Use the available evidence above to bound the search.
3. Reach one of the likely root causes.

Recovery procedure

(Do not reveal until you have reasoned through the problem.)

1. Identify the failing component.
2. Apply the remediation pathway.
3. Validate with the verification step.
4. Document the incident.

Remediation

1. Edit panel. 2. Test query. 3. Fix.

Verification

Panel renders correctly.

Rollback

Revert

Prevention

Pre-commit query validation