Custom actuator metric with request counter

src/main/java/nl/dtls/fairdatapoint/config/ActuatorConfig.java

@@ -0,0 +1,55 @@
+/**
+ * The MIT License
+ * Copyright © 2017 DTL
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package nl.dtls.fairdatapoint.config;
+
+import io.micrometer.common.KeyValue;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.server.observation.DefaultServerRequestObservationConvention;
+import org.springframework.http.server.observation.ServerRequestObservationContext;
+
+@Configuration
+public class ActuatorConfig {
+
+    /**
+     * Replaces the default `uri` path-pattern values with full paths in actuator metrics http.server.requests
+     */
+    @Bean
+    DefaultServerRequestObservationConvention customServerRequestObservationConvention() {
+        return new DefaultServerRequestObservationConvention() {
+            /**
+             * Replace the default URI path pattern (e.g. `/catalog/{id}`) with the full URI path (e.g. `/catalog/123`).
+             * This is high-cardinality data, but we add it as low-cardinality to make sure it shows up in the metrics.
+             * Beware, this could lead to memory issues in case of excessive number of URIs.
+             * See micrometer docs for more info.
+             * @param context ServerRequestObservationContext
+             * @return KeyValue with full uri
+             */
+            @Override
+            protected KeyValue uri(ServerRequestObservationContext context) {
+                // note the resulting tag name is "http.url" instead of "uri"
+                return super.httpUrl(context);
+            }
+        };
+    }
+}

src/main/resources/application.yml

@@ -24,16 +24,19 @@ spring:
       thread-name-prefix: fdp-task-
 
 management:
-  health:
-    solr:
-      enabled:  false
   info:
     defaults:
       enabled: false
   endpoints:
     web:
       exposure:
-        include: health, info
+        include: health, info, metrics
+  # todo: for some unknown reason, the following metrics filter has no effect (but works in fresh spring project)
+  metrics:
+    enable:
+      all: false
+      http:
+        server: true
 
 security:
   jwt: