Emit health metrics for OTel SDK metric collection and export

distribution/tools/server-cli/src/main/java/org/elasticsearch/server/cli/APMJvmOptions.java

@@ -26,11 +26,14 @@
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Iterator;
+import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
 import java.util.Set;
 import java.util.StringJoiner;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
 
 import static org.elasticsearch.telemetry.TelemetryProvider.OTEL_METRICS_ENABLED_SYSTEM_PROPERTY;
 
@@ -160,6 +163,7 @@ static List<String> apmJvmOptions(Settings settings, @Nullable SecureSettings se
         if (agentMetricsEnabled == false) {
             propertiesMap.put("metrics_interval", "0s");
             propertiesMap.put("disable_metrics", "*");
+            disableMetricInstrumentation(propertiesMap);
         }
 
         // Configures a log file to write to. Don't disable writing to a log file,
@@ -263,6 +267,22 @@ static Map<String, String> extractApmSettings(Settings settings) throws UserExce
         return propertiesMap;
     }
 
+    /**
+     * Disables the APM Agent hook that adds an exporter to application {@code SdkMeterProvider} instances.
+     * When Elasticsearch uses the OTel SDK for metrics, that hook is redundant and can break export;
+     * traces still use the APM Agent through {@code GlobalOpenTelemetry}.
+     */
+    static void disableMetricInstrumentation(Map<String, String> propertiesMap) {
+        LinkedHashSet<String> parts = new LinkedHashSet<>();
+        String existing = propertiesMap.get("disable_instrumentations");
+        for (String p : Strings.splitStringByCommaToArray(existing)) {
+            parts.add(p.trim());
+        }
+        parts.add("opentelemetry-metrics");
+        String newValue = parts.stream().filter(Predicate.not(String::isBlank)).collect(Collectors.joining(","));
+        propertiesMap.put("disable_instrumentations", newValue);
+    }
+
     private static StringJoiner extractGlobalLabels(String prefix, Map<String, String> propertiesMap, Settings settings) {
         // special handling of global labels, the agent expects them in format: key1=value1,key2=value2
         final Settings globalLabelsSettings = settings.getByPrefix(prefix + "global_labels.");