[APM] Re-revert "Collect telemetry about data/API performance" (elast…

…ic#61030)

* Revert "Revert "[APM] Collect telemetry about data/API performance (elastic#51612)""

This reverts commit 6de7f2a.

* Update transaction mock data to reflect the type

x-pack/legacy/plugins/apm/index.ts

@@ -14,7 +14,13 @@ import mappings from './mappings.json';
 
 export const apm: LegacyPluginInitializer = kibana => {
   return new kibana.Plugin({
-    require: ['kibana', 'elasticsearch', 'xpack_main', 'apm_oss'],
+    require: [
+      'kibana',
+      'elasticsearch',
+      'xpack_main',
+      'apm_oss',
+      'task_manager'
+    ],
     id: 'apm',
     configPrefix: 'xpack.apm',
     publicDir: resolve(__dirname, 'public'),
@@ -76,7 +82,10 @@ export const apm: LegacyPluginInitializer = kibana => {
         serviceMapTraceIdBucketSize: Joi.number().default(65),
         serviceMapFingerprintGlobalBucketSize: Joi.number().default(1000),
         serviceMapTraceIdGlobalBucketSize: Joi.number().default(6),
-        serviceMapMaxTracesPerRequest: Joi.number().default(50)
+        serviceMapMaxTracesPerRequest: Joi.number().default(50),
+
+        // telemetry
+        telemetryCollectionEnabled: Joi.boolean().default(true)
       }).default();
     },
 
@@ -122,10 +131,12 @@ export const apm: LegacyPluginInitializer = kibana => {
           }
         }
       });
-
       const apmPlugin = server.newPlatform.setup.plugins
         .apm as APMPluginContract;
-      apmPlugin.registerLegacyAPI({ server });
+
+      apmPlugin.registerLegacyAPI({
+        server
+      });
     }
   });
 };