remove duplication in tomcat JMX config (#12172)

instrumentation/jmx-metrics/javaagent/src/main/resources/jmx/rules/tomcat.yaml

@@ -1,48 +1,11 @@
 ---
 # For Tomcat, the default JMX domain is "Catalina:", however with some deployments like embedded in spring-boot
-# we can have the "Tomcat:" domain used, thus we have to duplicate metrics definitions as using a wildcard
-# would match too broadly
+# we can have the "Tomcat:" domain used, thus we use both MBean names for the metrics.
 
 rules:
-  - bean: Catalina:type=GlobalRequestProcessor,name=*
-    unit: "1"
-    prefix: http.server.tomcat.
-    metricAttribute:
-      name: param(name)
-    mapping:
-      errorCount:
-        metric: errorCount
-        type: gauge
-        desc: The number of errors per second on all request processors
-      requestCount:
-        metric: requestCount
-        type: gauge
-        desc: The number of requests per second across all request processors
-      maxTime:
-        metric: maxTime
-        type: gauge
-        unit: ms
-        desc: The longest request processing time
-      processingTime:
-        metric: processingTime
-        type: counter
-        unit: ms
-        desc: Total time for processing all requests
-      bytesReceived:
-        metric: traffic
-        type: counter
-        unit: By
-        desc: The number of bytes transmitted
-        metricAttribute:
-          direction: const(received)
-      bytesSent:
-        metric: traffic
-        type: counter
-        unit: By
-        desc: The number of bytes transmitted
-        metricAttribute:
-          direction: const(sent)
-  - bean: Tomcat:type=GlobalRequestProcessor,name=*
+  - beans:
+    - Catalina:type=GlobalRequestProcessor,name=*
+    - Tomcat:type=GlobalRequestProcessor,name=*
     unit: "1"
     prefix: http.server.tomcat.
     metricAttribute:
@@ -81,17 +44,9 @@ rules:
         metricAttribute:
           direction: const(sent)
 
-  - bean: Catalina:type=Manager,host=localhost,context=*
-    unit: "1"
-    prefix: http.server.tomcat.
-    type: updowncounter
-    metricAttribute:
-      context: param(context)
-    mapping:
-      activeSessions:
-        metric: sessions.activeSessions
-        desc: The number of active sessions
-  - bean: Tomcat:type=Manager,host=localhost,context=*
+  - beans:
+    - Catalina:type=Manager,host=localhost,context=*
+    - Tomcat:type=Manager,host=localhost,context=*
     unit: "1"
     prefix: http.server.tomcat.
     type: updowncounter
@@ -102,24 +57,9 @@ rules:
         metric: sessions.activeSessions
         desc: The number of active sessions
 
-  - bean: Catalina:type=ThreadPool,name=*
-    unit: "{threads}"
-    prefix: http.server.tomcat.
-    type: updowncounter
-    metricAttribute:
-      name: param(name)
-    mapping:
-      currentThreadCount:
-        metric: threads
-        desc: Thread Count of the Thread Pool
-        metricAttribute:
-          state: const(idle)
-      currentThreadsBusy:
-        metric: threads
-        desc: Thread Count of the Thread Pool
-        metricAttribute:
-          state: const(busy)
-  - bean: Tomcat:type=ThreadPool,name=*
+  - beans:
+    - Catalina:type=ThreadPool,name=*
+    - Tomcat:type=ThreadPool,name=*
     unit: "{threads}"
     prefix: http.server.tomcat.
     type: updowncounter
@@ -136,3 +76,4 @@ rules:
         desc: Thread Count of the Thread Pool
         metricAttribute:
           state: const(busy)
+