feat(maintenance): Per-endpoint maintenance configuration (#982)

* feat: add endpoint.maintenance-windows array for per-endpoint maintenance configuration

* doc: initial entry for maintenance windows in endpoint config

* doc: example documentation for per-endpoint configuration of maintenance
windows

* chore: var => :=

* test: add checks for maintenance window defaults in endpoint configuration

* chore: clean up new-lines

---------

Co-authored-by: TwiN <twin@linux.com>

watchdog/watchdog.go

@@ -80,7 +80,14 @@ func execute(ep *endpoint.Endpoint, alertingConfig *alerting.Config, maintenance
 	} else {
 		logr.Infof("[watchdog.execute] Monitored group=%s; endpoint=%s; key=%s; success=%v; errors=%d; duration=%s", ep.Group, ep.Name, ep.Key(), result.Success, len(result.Errors), result.Duration.Round(time.Millisecond))
 	}
-	if !maintenanceConfig.IsUnderMaintenance() {
+	inEndpointMaintenanceWindow := false
+	for _, maintenanceWindow := range ep.MaintenanceWindows {
+		if maintenanceWindow.IsUnderMaintenance() {
+			logr.Debug("[watchdog.execute] Under endpoint maintenance window")
+			inEndpointMaintenanceWindow = true
+		}
+	}
+	if !maintenanceConfig.IsUnderMaintenance() && !inEndpointMaintenanceWindow {
 		// TODO: Consider moving this after the monitoring lock is unlocked? I mean, how much noise can a single alerting provider cause...
 		HandleAlerting(ep, result, alertingConfig)
 	} else {