add monitoring of Spring Boot Camel routes

kontor-spring/src/main/java/de/thpeetz/kontor/Application.java

@@ -1,15 +1,28 @@
 package de.thpeetz.kontor;
 
+import org.apache.camel.CamelContext;
+import org.apache.camel.component.micrometer.MicrometerConstants;
+import org.apache.camel.component.micrometer.messagehistory.MicrometerMessageHistoryFactory;
+import org.apache.camel.component.micrometer.routepolicy.MicrometerRoutePolicyFactory;
+import org.apache.camel.spring.boot.CamelContextConfiguration;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
 
 import com.vaadin.flow.component.page.AppShellConfigurator;
 import com.vaadin.flow.server.PWA;
 import com.vaadin.flow.theme.Theme;
 
+import io.micrometer.core.instrument.Clock;
+import io.micrometer.prometheus.PrometheusConfig;
+import io.micrometer.prometheus.PrometheusMeterRegistry;
+import io.prometheus.client.CollectorRegistry;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
 
+
+
 @Slf4j
 @EnableJpaAuditing
 @SpringBootApplication
@@ -17,6 +30,27 @@ import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
 @PWA(name = "Vaadin Kontor", shortName = "Kontor", offlinePath = "offline.html", offlineResources = { "images/offline.png" })
 public class Application implements AppShellConfigurator {
 
+    @Bean(name = { MicrometerConstants.METRICS_REGISTRY_NAME, "prometheusMeterRegistry" })
+    public PrometheusMeterRegistry prometheusMeterRegistry(
+        PrometheusConfig prometheusConfig, CollectorRegistry collectorRegistry, Clock clock) {
+            return new PrometheusMeterRegistry(prometheusConfig, collectorRegistry, clock);
+        }
+
+    @Bean
+    public CamelContextConfiguration camelContextConfiguration(@Autowired PrometheusMeterRegistry registry) {
+        return new CamelContextConfiguration() {
+            @Override
+            public void beforeApplicationStart(CamelContext camelContext) {
+                camelContext.addRoutePolicyFactory(new MicrometerRoutePolicyFactory());
+                camelContext.setMessageHistoryFactory(new MicrometerMessageHistoryFactory());
+            }
+
+            @Override
+            public void afterApplicationStart(CamelContext camelContext) {
+            }
+        };
+    }
+
     public static void main(String[] args) {
         log.info("Starting Kontor application");
         SpringApplication.run(Application.class);

kontor-spring/src/main/resources/application.yml

@@ -25,6 +25,9 @@ spring:
       max-file-size: 10MB
       max-request-size: 10MB
 camel:
+  component:
+    metrics:
+      metric-registry: prometheusMeterRegistry
   cloud:
     enabled: true
   springboot: