Fix namespace issue for build counters (#616)

src/main/java/org/jenkinsci/plugins/prometheus/collectors/builds/CounterManager.java

@@ -5,6 +5,8 @@
 
 import org.jenkinsci.plugins.prometheus.collectors.CollectorType;
 import org.jenkinsci.plugins.prometheus.collectors.MetricCollector;
+import org.jenkinsci.plugins.prometheus.config.PrometheusConfiguration;
+import org.jenkinsci.plugins.prometheus.util.ConfigurationUtils;
 
 import hudson.model.Run;
 import io.prometheus.client.Collector;
@@ -80,13 +82,17 @@ private static class CounterEntry {
         // Prefix of the counter.
         private String prefix;
 
+        // namespace of the counter
+        private String namespace;
+
         /*
          * Creates new counter entry
          */
         public CounterEntry(CollectorType type, String[] labels, String prefix) {
             this.labels = labels;
             this.type = type;
             this.prefix = prefix;
+            this.namespace = ConfigurationUtils.getNamespace();
         }
 
         @Override
@@ -98,14 +104,21 @@ public boolean equals(Object obj) {
 
             CounterEntry entry = (CounterEntry) obj;
 
+            // Compare the prefix
             if(this.prefix != null && !this.prefix.equals(entry.prefix)){
                 return false;
             }
 
+            // Compare the entry Counter type
             if(this.type != entry.type){
                 return false;
             }
 
+            // Compare namespace values.
+            if(this.namespace != null && !this.namespace.equals(entry.namespace)){
+                return false;
+            }
+
             // Compare labels
             return Arrays.equals(labels, entry.labels);
         }
@@ -114,7 +127,8 @@ public boolean equals(Object obj) {
         public int hashCode() {
             int typeHash = type != null ? type.hashCode() : 0;
             int prefixHash = prefix != null ? prefix.hashCode() : 0;
-            int result = 31 * (typeHash + Arrays.hashCode(labels) + prefixHash);
+            int namespaceHash = namespace != null ? namespace.hashCode() : 0;
+            int result = 31 * (typeHash + Arrays.hashCode(labels) + prefixHash + namespaceHash);
             return result;
         }
     }

src/test/java/org/jenkinsci/plugins/prometheus/collectors/builds/CounterManagerTest.java

@@ -37,6 +37,27 @@ public void TestEquivalentEntryReturnsCounter() {
         }
     }
 
+    @Test
+    public void TestNamespaceChangeReturnsNewCounter() {
+        String[] labels = new String[] { "TestLabel" };
+
+        try (MockedStatic<PrometheusConfiguration> configStatic = mockStatic(PrometheusConfiguration.class)) {
+            PrometheusConfiguration config = mock(PrometheusConfiguration.class);
+
+            // Use default namespace for one counter
+            when(config.getDefaultNamespace()).thenReturn(getNamespace());
+            configStatic.when(PrometheusConfiguration::get).thenReturn(config);
+            var retrievedCounter = manager.getCounter(CollectorType.BUILD_SUCCESSFUL_COUNTER, labels, null);
+
+            // Second counter returns modified namespace
+            when(config.getDefaultNamespace()).thenReturn("modified_namespace");
+            var retrievedCounter2 = manager.getCounter(CollectorType.BUILD_SUCCESSFUL_COUNTER, labels, null);
+
+            // Should be a value reference comparison. They should not be the same metric since the namespace has changed.
+            Assert.assertNotEquals(retrievedCounter, retrievedCounter2);
+        }
+    }
+
     @Test
     public void TestLabelChangeReturnsNewCounter(){
           String[] label1 = new String[]{"labels"};