From 78228c6331be27029d74922c655ef578830f141a Mon Sep 17 00:00:00 2001
From: izeye <izeye@naver.com>
Date: Mon, 8 Feb 2021 23:00:59 +0900
Subject: [PATCH] Demonstrate how to log meters having a specific prefix in
 their name

See https://github.com/micrometer-metrics/micrometer/issues/2426
---
 build.gradle                                  |  2 +-
 .../java/com/izeye/sample/TestRunner.java     |  8 +++
 .../FilteredPrometheusScrapeEndpoint.java     | 54 -------------------
 3 files changed, 9 insertions(+), 55 deletions(-)
 delete mode 100644 src/main/java/com/izeye/sample/support/metrics/FilteredPrometheusScrapeEndpoint.java

diff --git a/build.gradle b/build.gradle
index d146b8b..7502dc2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -34,7 +34,7 @@ dependencies {
     implementation("org.springframework.boot:spring-boot-starter-web")
     implementation("org.springframework.boot:spring-boot-starter-actuator")
 
-    implementation("io.micrometer:micrometer-registry-prometheus")
+//    implementation("io.micrometer:micrometer-registry-prometheus")
 
     compileOnly("com.google.code.findbugs:jsr305:latest.release")
 
diff --git a/src/main/java/com/izeye/sample/TestRunner.java b/src/main/java/com/izeye/sample/TestRunner.java
index 7dffdf0..52f4a53 100644
--- a/src/main/java/com/izeye/sample/TestRunner.java
+++ b/src/main/java/com/izeye/sample/TestRunner.java
@@ -1,5 +1,6 @@
 package com.izeye.sample;
 
+import io.micrometer.core.instrument.Meter;
 import io.micrometer.core.instrument.MeterRegistry;
 import io.micrometer.core.instrument.Tags;
 import io.micrometer.core.instrument.binder.jvm.ExecutorServiceMetrics;
@@ -33,6 +34,13 @@ public void run(ApplicationArguments args) {
 
             createExecutor(executorServiceName, tags);
         }
+
+        for (Meter meter : this.meterRegistry.getMeters()) {
+            Meter.Id id = meter.getId();
+            if (id.getName().startsWith("executor.")) {
+                System.out.println(id);
+            }
+        }
     }
 
     private void createExecutor(String executorServiceName, Tags tags) {
diff --git a/src/main/java/com/izeye/sample/support/metrics/FilteredPrometheusScrapeEndpoint.java b/src/main/java/com/izeye/sample/support/metrics/FilteredPrometheusScrapeEndpoint.java
deleted file mode 100644
index 03a8342..0000000
--- a/src/main/java/com/izeye/sample/support/metrics/FilteredPrometheusScrapeEndpoint.java
+++ /dev/null
@@ -1,54 +0,0 @@
-package com.izeye.sample.support.metrics;
-
-import java.io.IOException;
-import java.io.StringWriter;
-import java.io.Writer;
-import java.util.Enumeration;
-import java.util.Set;
-
-import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
-import org.springframework.boot.actuate.endpoint.web.annotation.WebEndpoint;
-import org.springframework.lang.Nullable;
-import org.springframework.stereotype.Component;
-
-import io.prometheus.client.Collector;
-import io.prometheus.client.CollectorRegistry;
-import io.prometheus.client.exporter.common.TextFormat;
-
-/**
- * Filter-supported {@link org.springframework.boot.actuate.metrics.export.prometheus.PrometheusScrapeEndpoint}.
- *
- * @author Johnny Lim
- */
-@Component
-@WebEndpoint(id = "filteredPrometheus")
-public class FilteredPrometheusScrapeEndpoint  {
-
-	private final CollectorRegistry collectorRegistry;
-
-	public FilteredPrometheusScrapeEndpoint(CollectorRegistry collectorRegistry) {
-		this.collectorRegistry = collectorRegistry;
-	}
-
-	@ReadOperation(produces = TextFormat.CONTENT_TYPE_004)
-	public String scrape(@Nullable Set<String> includedNames) {
-		try {
-			Writer writer = new StringWriter();
-			TextFormat.write004(writer, getSamples(includedNames));
-			return writer.toString();
-		}
-		catch (IOException ex) {
-			// This actually never happens since StringWriter::write() doesn't throw any
-			// IOException
-			throw new RuntimeException("Writing metrics failed", ex);
-		}
-	}
-
-	private Enumeration<Collector.MetricFamilySamples> getSamples(@Nullable Set<String> includedNames) {
-		if (includedNames == null) {
-			return this.collectorRegistry.metricFamilySamples();
-		}
-		return this.collectorRegistry.filteredMetricFamilySamples(includedNames);
-	}
-
-}