Allow to set prefix for Micrometer prefixes

Author: LEDfan

src/main/java/eu/openanalytics/containerproxy/stat/impl/Micrometer.java

@@ -81,15 +81,15 @@ public void init() {
         userLogouts = registry.counter("userLogouts");
         appStartFailedCounter = registry.counter("startFailed");
         authFailedCounter = registry.counter("authFailed");
-        registry.gauge("shinyproxy_absolute_users_logged_in", Tags.empty(), sessionService, ISessionService::getLoggedInUsersCount);
-        registry.gauge("shinyproxy_absolute_users_active", Tags.empty(), sessionService, ISessionService::getActiveUsersCount);
+        registry.gauge("absolute_users_logged_in", Tags.empty(), sessionService, ISessionService::getLoggedInUsersCount);
+        registry.gauge("absolute_users_active", Tags.empty(), sessionService, ISessionService::getActiveUsersCount);
 
         for (ProxySpec spec : proxyService.getProxySpecs(null, true)) {
             registry.counter("appStarts", "spec.id", spec.getId());
             registry.counter("appStops", "spec.id", spec.getId());
             ProxyCounter proxyCounter = new ProxyCounter(spec.getId());
             proxyCounters.add(proxyCounter);
-            registry.gauge("shinyproxy_absolute_apps_running", Tags.of("spec.id", spec.getId()), proxyCounter, ProxyCounter::getProxyCount);
+            registry.gauge("absolute_apps_running", Tags.of("spec.id", spec.getId()), proxyCounter, ProxyCounter::getProxyCount);
             registry.timer("startupTime", "spec.id", spec.getId());
             registry.timer("usageTime", "spec.id", spec.getId());
         }

src/main/java/eu/openanalytics/containerproxy/stat/impl/MicrometerRegistryConfiguration.java

@@ -0,0 +1,72 @@
+/**
+ * ContainerProxy
+ *
+ * Copyright (C) 2016-2021 Open Analytics
+ *
+ * ===========================================================================
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the Apache License as published by
+ * The Apache Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * Apache License for more details.
+ *
+ * You should have received a copy of the Apache License
+ * along with this program.  If not, see <http://www.apache.org/licenses/>
+ */
+package eu.openanalytics.containerproxy.stat.impl;
+
+import io.micrometer.core.instrument.Meter;
+import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.lang.NonNull;
+import io.micrometer.core.lang.Nullable;
+import io.micrometer.prometheus.PrometheusNamingConvention;
+import org.springframework.boot.actuate.autoconfigure.metrics.MeterRegistryCustomizer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.env.Environment;
+
+import javax.inject.Inject;
+
+@Configuration(proxyBeanMethods = false)
+public class MicrometerRegistryConfiguration {
+
+    private static final String PROP_METRIC_PREFIX = "proxy.usage-stats-micrometer-prefix";
+
+    @Inject
+    private Environment environment;
+
+    private String getPrefix() {
+        String prefix = environment.getProperty(PROP_METRIC_PREFIX, "").trim();
+        if (!prefix.isEmpty()) {
+            prefix += ".";
+        }
+        return prefix;
+    }
+
+    @Bean
+    public MeterRegistryCustomizer<MeterRegistry> metricsCommonTags() {
+        String prefix = getPrefix();
+        return (registry) -> registry
+                .config()
+                .namingConvention(new PrometheusNamingConvention() {
+                    @NonNull
+                    @Override
+                    public String name(@NonNull String name, @NonNull Meter.Type type, @Nullable String baseUnit) {
+                        return super.name(prefix + name, type, baseUnit);
+                    }
+
+                    @NonNull
+                    @Override
+                    public String tagKey(@NonNull String key) {
+                        return super.tagKey(key);
+                    }
+                });
+    }
+
+
+}