A county security lead asks when to use detection-as-code instead of ad-hoc SIEM clicks. What strategy vocabulary applies?

A county security lead asking when to use detection-as-code instead of ad-hoc SIEM clicks should apply detection-as-code so detections are versioned, reviewable, and testable. Encoding detections in reviewed artifacts (queries, rules, tests) under change control lets municipal teams peer-review logic, roll back bad rules, and prove to auditors how a detection evolved. Ad-hoc console clicks may be fine for emergency hotfixes, but they do not scale as the durable strategy for a county detection program.

Why the other options fail by concept: Applying detection-as-code so wiki pages are versioned and reviewable rather than ad-hoc SIEM clicks versions the wrong artifact, because wiki documentation lacks executable queries, automated testing, and enforceable pull-request review that versioned detections provide. Applying detection-as-code so sensor agents are versioned and reviewable rather than ad-hoc SIEM clicks versions the wrong layer, leaving the actual SIEM detection queries outside version control and unreviewed. Applying detection-as-code so detections are versioned and reviewable in notebooks after ad-hoc SIEM clicks inverts the lifecycle, because review must happen before deployment through pull requests, not after personal notebooks are already live from clicks.

Exam caveat: Detection-as-code still requires runtime validation in the SIEM or XDR; versioned files that never deploy help nobody. Operational check: take one ad-hoc county detection, export it into the detection-as-code repo with owner and test case, deploy through review, and confirm the SIEM rule matches the reviewed artifact hash or version tag.