EDOT central config polling and sampling

x-pack/solutions/observability/plugins/apm/common/agent_configuration/setting_definitions/edot_sdk_settings.ts

@@ -72,6 +72,36 @@ export const edotSDKSettings: RawSettingDefinition[] = [
       'opentelemetry/dotnet/elastic',
     ],
   },
+  {
+    key: 'opamp_polling_interval',
+    type: 'duration',
+    defaultValue: '30s',
+    min: '1s',
+    label: i18n.translate('xpack.apm.agentConfig.pollingInterval.label', {
+      defaultMessage: 'OpAMP HTTP polling interval',
+    }),
+    description: i18n.translate('xpack.apm.agentConfig.pollingInterval.description', {
+      defaultMessage:
+        'The default interval between checking the collector for new changes to config.\n' +
+        'Note the interval is automatically exponentially extended on failures then reset to the value specified here, on recovery.',
+    }),
+    includeAgents: ['opentelemetry/java/elastic'],
+  },
+  {
+    key: 'sampling_rate',
+    type: 'float',
+    defaultValue: '1.0',
+    label: i18n.translate('xpack.apm.agentConfig.samplingRate.label', {
+      defaultMessage: 'Sampling rate',
+    }),
+    description: i18n.translate('xpack.apm.agentConfig.samplingRate.description', {
+      defaultMessage:
+        'By default, the agent will sample every span in every trace (e.g. request to your service). ' +
+        'To reduce overhead and storage requirements, you can set the sampling rate to a value between 0.0 and 1.0. ' +
+        'Further details can be found in the [OpenTelemetry Sampling Concepts](https://opentelemetry.io/docs/concepts/sampling/) page.',
+    }),
+    includeAgents: ['opentelemetry/java/elastic', 'opentelemetry/python/elastic'],
+  },
   {
     key: 'send_traces',
     type: 'boolean',

x-pack/solutions/observability/plugins/apm/common/agent_configuration/setting_definitions/index.test.ts

@@ -195,6 +195,8 @@ describe('filterByAgent', () => {
           'deactivate_all_instrumentations',
           'deactivate_instrumentations',
           'logging_level',
+          'opamp_polling_interval',
+          'sampling_rate',
           'send_logs',
           'send_metrics',
           'send_traces',
@@ -210,7 +212,7 @@ describe('filterByAgent', () => {
 
     it('opentelemetry/python/elastic', () => {
       expect(getSettingKeysForAgent('opentelemetry/python/elastic')).toEqual(
-        expect.arrayContaining(['logging_level'])
+        expect.arrayContaining(['logging_level', 'sampling_rate'])
       );
     });
 

x-pack/solutions/observability/plugins/apm/common/agent_configuration/setting_definitions/index.ts

@@ -47,7 +47,7 @@ function getSettingDefaults(setting: RawSettingDefinition): SettingDefinition {
     }
 
     case 'float': {
-      if (setting.key === 'transaction_sample_rate') {
+      if (setting.key === 'transaction_sample_rate' || setting.key === 'sampling_rate') {
         return {
           validation: floatFourDecimalPlacesRt,
           ...setting,