Rise th2_component metric with box name as name label value (#295)

README.md

@@ -433,6 +433,10 @@ NOTES:
 * some metric labels are
   enumerations (`th2_type`: `MESSAGE_GROUP`, `EVENT`, `<customTag>`;`message_type`: `RAW_MESSAGE`, `MESSAGE`)
 
+COMMON METRICS:
+
+* th2_component (`name`): information about the current component
+
 RABBITMQ METRICS:
 
 * th2_rabbitmq_message_size_publish_bytes (`th2_pin`, `th2_type`, `exchange`, `routing_key`): number of published
@@ -509,7 +513,8 @@ dependencies {
 
 ### 5.10.1-dev
 
-+ Use box name from `box.json` config as RabbitMQ connection name  
++ Use box name from `box.json` config as RabbitMQ connection name
++ Rise `th2_component` metric with box name as `name` label value
 
 ### 5.10.0-dev
 

src/main/java/com/exactpro/th2/common/schema/factory/AbstractCommonFactory.java

@@ -28,6 +28,7 @@
 import com.exactpro.th2.common.grpc.MessageID;
 import com.exactpro.th2.common.grpc.RawMessageBatch;
 import com.exactpro.th2.common.metrics.CommonMetrics;
+import com.exactpro.th2.common.metrics.ComponentMetric;
 import com.exactpro.th2.common.metrics.MetricMonitor;
 import com.exactpro.th2.common.metrics.PrometheusConfiguration;
 import com.exactpro.th2.common.schema.box.configuration.BoxConfiguration;
@@ -187,6 +188,7 @@ public void start() {
 
         // init exporter
         prometheusExporter.getOrNull();
+        ComponentMetric.enable(getBoxConfiguration().getBoxName());
         livenessMonitor.enable();
     }
 

src/main/kotlin/com/exactpro/th2/common/metrics/ComponentMetric.kt

@@ -0,0 +1,30 @@
+/*
+ *  Copyright 2024 Exactpro (Exactpro Systems Limited)
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+@file:JvmName("ComponentMetric")
+
+package com.exactpro.th2.common.metrics
+
+import io.prometheus.client.Gauge
+
+private val COMPONENT_METRIC: Gauge = Gauge.build(
+    "th2_component",
+    "Information about the current component"
+).labelNames("name")
+    .register()
+
+internal fun enable(componentName: String) {
+    COMPONENT_METRIC.labels(componentName).set(1.0)
+}