#5059 "Alert state machine: acknowledgement holds until resolve; N consecutive OK to resolve; editing, disabling or deleting a rule resets it". - The state machine is now next_step(), a pure function of one sample. An acknowledged alert stays acknowledged while breached; before, the next breaching sample re-fired it. Firing and acknowledged alerts resolve after consecutive_ok_required OK checks in a row (new rule column, default 1; rule form, rules list and MCP create/update_alert_rule clear_after_checks). - Changing what a rule watches (source, resource, metric, operator, threshold) or disabling it resets its alert to inactive; a firing or acknowledged one records a resolved event whose new note says why, and nobody is notified. Web and MCP edits share alerts.service.apply_rule_change. - Migration 0028: consecutive_ok_required, consecutive_ok_count, alert_events.note, and metric_value nullable (a reset has no sample). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>