fix(monitoring): correct Kafka metrics and alert rules

- Why:
  - dashboard showed offset as throughput and produced misleading values
  - kafka-exporter metric/label naming was inconsistent across alerts/docs
  - consumer-group-missing alert was noisy for demo runs
- What:
  - switch throughput panel to rate(kafka_topic_partition_current_offset[5m]) aggregated by topic and exclude __* topics
  - align lag metric/labels to kafka_consumergroup_lag + consumergroup
  - remove Kafka Consumer Group Missing alert from provisioning
  - pin kafka-exporter image to v1.9.0 and update OPERATIONS.md checks
- Check:
  - airflow dags list-import-errors -> No data found
  - Prometheus targets: clickhouse up, kafka up
  - PromQL kafka_consumergroup_lag returns series
  - Grafana dashboards provisioning reload returns success

configs/grafana/provisioning/alerting/kafka-alert-rules.yml

@@ -102,10 +102,10 @@ groups:
                 type: prometheus
                 uid: prometheus_uid
               editorMode: code
-              expr: kafka_consumer_group_lag
+              expr: kafka_consumergroup_lag
               instant: false
               intervalMs: 1000
-              legendFormat: "{{ group }} - {{ topic }}:{{ partition }}"
+              legendFormat: "{{ consumergroup }} - {{ topic }}:{{ partition }}"
               maxDataPoints: 43200
               range: true
               refId: A
@@ -163,7 +163,7 @@ groups:
         execErrState: Error
         for: 5m
         annotations:
-          summary: "Высокий лаг консьюмера {{ $labels.group }}"
+          summary: "Высокий лаг консьюмера {{ $labels.consumergroup }}"
           description: "Lag для {{ $labels.topic }}:{{ $labels.partition }} составляет {{ $values.A }} сообщений (порог: 10000)"
         labels:
           severity: warning
@@ -248,34 +248,3 @@ groups:
           description: "Rate сообщений < 0.1 msg/sec в течение 10 минут"
         labels:
           severity: warning
-
-      # --- Alert: Consumer Group Missing ---
-      - uid: kafka_consumer_group_missing
-        title: Kafka Consumer Group Missing
-        condition: C
-        data:
-          - refId: A
-            relativeTimeRange:
-              from: 300
-              to: 0
-            datasourceUid: prometheus_uid
-            model:
-              datasource:
-                type: prometheus
-                uid: prometheus_uid
-              editorMode: code
-              expr: count by (group) (kafka_consumer_group_lag)
-              instant: true
-              intervalMs: 1000
-              legendFormat: "{{ group }}"
-              maxDataPoints: 43200
-              range: false
-              refId: A
-        noDataState: Alerting
-        execErrState: Error
-        for: 5m
-        annotations:
-          summary: "Пропала консьюмер-группа"
-          description: "Консьюмер-группа не обнаружена в течение 5 минут"
-        labels:
-          severity: info

configs/grafana/provisioning/dashboards/kafka-overview.json

@@ -277,7 +277,7 @@
             "type": "prometheus",
             "uid": "prometheus_uid"
           },
-          "expr": "count(count by (group) (kafka_consumergroup_lag))",
+          "expr": "count(count by (consumergroup) (kafka_consumergroup_lag))",
           "refId": "A"
         }
       ],
@@ -378,8 +378,8 @@
             "type": "prometheus",
             "uid": "prometheus_uid"
           },
-          "expr": "kafka_topic_partition_current_offset",
+          "expr": "sum by(topic) (rate(kafka_topic_partition_current_offset{topic!~\"__.*\"}[5m]))",
-          "legendFormat": "{{topic}} - p{{partition}}",
+          "legendFormat": "{{topic}}",
           "refId": "A"
         }
       ],
@@ -478,7 +478,7 @@
             "uid": "prometheus_uid"
           },
           "expr": "kafka_consumergroup_lag",
-          "legendFormat": "{{group}} - {{topic}}:{{partition}}",
+          "legendFormat": "{{consumergroup}} - {{topic}}:{{partition}}",
           "refId": "A"
         }
       ],

docker-compose.yml

@@ -232,7 +232,7 @@ services:
 
   # Kafka Exporter для мониторинга через Prometheus
   kafka-exporter:
-    image: danielqsj/kafka-exporter:latest
+    image: danielqsj/kafka-exporter:v1.9.0
     command: ["--kafka.server=kafka:29092"]
     ports:
       - "9308:9308"

docs/OPERATIONS.md

@@ -200,7 +200,7 @@ curl -s "http://localhost:9090/api/v1/query?query=ClickHouseProfileEvents_Query"
 
 # Prometheus собирает метрики Kafka
 curl -s "http://localhost:9090/api/v1/query?query=kafka_brokers"
-curl -s "http://localhost:9090/api/v1/query?query=kafka_consumer_group_lag"
+curl -s "http://localhost:9090/api/v1/query?query=kafka_consumergroup_lag"
 
 # Прямая проверка kafka-exporter
 curl -s http://localhost:9308/metrics | grep "^kafka_"
@@ -227,9 +227,9 @@ curl -s "http://localhost:9090/api/v1/query?query=ClickHouseProfileEvents_Query"
 
 Настроены правила:
 - `Kafka Broker Down` — `kafka_brokers < 1` в течение `1m`
-- `Kafka Consumer Lag High` — `kafka_consumer_group_lag > 10000` в течение `5m`
+- `Kafka Consumer Lag High` — `kafka_consumergroup_lag > 10000` в течение `5m`
 - `Kafka No Messages Produced` — `rate(kafka_topic_partition_current_offset[5m]) < 0.1` в течение `10m`
-- `Kafka Consumer Group Missing` — пропала консьюмер-группа в течение `5m`
+- `Kafka Consumer Group Missing` не включён: для демо-стенда даёт шум на стартовых прогонах и не повышает диагностику по сравнению с lag/throughput.
 
 Проверка и reload без рестарта контейнера: