Добавлены метрики Prometheus и дашборды Grafana (этап 2.5)

Все три Go-сервиса (ingest, device-control, rule-engine) отдают
/metrics в формате Prometheus: счётчики MQTT/RabbitMQ/ClickHouse
операций, гистограммы длительности батч-флашей и диспатча правил,
переходы устройств online/offline. Добавлены сервисы prometheus и
grafana в docker-compose с провижининг конфигом (datasource +
два готовых дашборда: "Ingest & Telemetry" и "Automation & Devices").

services/rule-engine-service/internal/engine/engine.go

@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"git.cactoz.su/cacto/home_automatization/services/rule-engine-service/internal/devicecontrolclient"
+	"git.cactoz.su/cacto/home_automatization/services/rule-engine-service/internal/metrics"
 	"git.cactoz.su/cacto/home_automatization/services/rule-engine-service/internal/rules"
 )
 
@@ -57,6 +58,8 @@ func New(ruleSource RuleSource, dispatcher Dispatcher, publisher TriggerPublishe
 // the whole reading for. A rule the device itself rejected (bad device_id,
 // unsupported action) is terminal and does not cause a retry.
 func (e *Engine) HandleReading(ctx context.Context, r Reading) error {
+	metrics.ReadingsConsumed.Inc()
+
 	matched := e.rules.MatchingRules(r.DeviceID, r.SensorType)
 
 	var firstTransportErr error
@@ -69,8 +72,11 @@ func (e *Engine) HandleReading(ctx context.Context, r Reading) error {
 		if !matchesCondition {
 			continue
 		}
+		metrics.RulesMatched.Inc()
 
+		start := time.Now()
 		result, dispatchErr := e.dispatcher.Dispatch(ctx, rule.TargetDeviceID, rule.ActionType, rule.ActionParams)
+		metrics.DispatchDuration.WithLabelValues(rule.ActionType).Observe(time.Since(start).Seconds())
 
 		success := dispatchErr == nil && result.Success
 		errMsg := result.Error
@@ -78,13 +84,16 @@ func (e *Engine) HandleReading(ctx context.Context, r Reading) error {
 		case dispatchErr != nil:
 			errMsg = dispatchErr.Error()
 			e.logger.Error("dispatch action failed", "rule_id", rule.ID, "target_device_id", rule.TargetDeviceID, "error", dispatchErr)
+			metrics.RulesTriggered.WithLabelValues(rule.ActionType, "transport_error").Inc()
 			if firstTransportErr == nil {
 				firstTransportErr = dispatchErr
 			}
 		case !result.Success:
 			e.logger.Warn("device rejected command", "rule_id", rule.ID, "target_device_id", rule.TargetDeviceID, "error", result.Error)
+			metrics.RulesTriggered.WithLabelValues(rule.ActionType, "rejected").Inc()
 		default:
 			e.logger.Info("rule triggered", "rule_id", rule.ID, "target_device_id", rule.TargetDeviceID, "action_type", rule.ActionType)
+			metrics.RulesTriggered.WithLabelValues(rule.ActionType, "success").Inc()
 		}
 
 		if pubErr := e.publisher.PublishRuleTriggered(ctx, rule.ID, rule.ZoneID, rule.TargetDeviceID, rule.ActionType, success, errMsg); pubErr != nil {