Required for elastic/kibana#50757.

Allows the kibana user to collect APM telemetry in a background task.

Author: ogupte

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authz/store/ReservedRolesStore.java

@@ -124,11 +124,19 @@ private static Map<String, RoleDescriptor> initializeReservedRoles() {
                                         .indices(".monitoring-*").privileges("read", "read_cross_cluster").build(),
                                 RoleDescriptor.IndicesPrivileges.builder()
                                         .indices(".management-beats").privileges("create_index", "read", "write").build(),
-                                // .apm-* is for APM's agent configuration and custom link index creation
+                                // APM agent configuration
                                 RoleDescriptor.IndicesPrivileges.builder()
                                         .indices(".apm-agent-configuration").privileges("all").build(),
+                                // APM custom link index creation
                                 RoleDescriptor.IndicesPrivileges.builder()
                                         .indices(".apm-custom-link").privileges("all").build(),
+                                // APM telemetry queries APM & ML anomalies indices in kibana task runner
+                                RoleDescriptor.IndicesPrivileges.builder()
+                                    .indices("apm-*")
+                                    .privileges("read", "read_cross_cluster", "view_index_metadata").build(),
+                                RoleDescriptor.IndicesPrivileges.builder()
+                                    .indices(".ml-anomalies-*")
+                                    .privileges("read", "read_cross_cluster", "view_index_metadata").build(),
                         },
                         null,
                         new ConfigurableClusterPrivilege[] { new ManageApplicationPrivileges(Collections.singleton("kibana-*")) },

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/authz/store/ReservedRolesStoreTests.java

@@ -396,6 +396,25 @@ public void testKibanaSystemRole() {
             assertThat(kibanaRole.indices().allowedIndicesMatcher(READ_CROSS_CLUSTER_NAME).test(index), is(true));
         });
 
+        // read-only indices for APM telemetry
+        Arrays.asList(
+            "apm-*",
+            ".ml-anomalies-*"
+        ).forEach((index) -> {
+            assertThat(kibanaRole.indices().allowedIndicesMatcher("indices:foo").test(index), is(false));
+            assertThat(kibanaRole.indices().allowedIndicesMatcher("indices:bar").test(index), is(false));
+            assertThat(kibanaRole.indices().allowedIndicesMatcher(DeleteIndexAction.NAME).test(index), is(false));
+            assertThat(kibanaRole.indices().allowedIndicesMatcher(GetIndexAction.NAME).test(index), is(true));
+            assertThat(kibanaRole.indices().allowedIndicesMatcher(CreateIndexAction.NAME).test(index), is(false));
+            assertThat(kibanaRole.indices().allowedIndicesMatcher(IndexAction.NAME).test(index), is(false));
+            assertThat(kibanaRole.indices().allowedIndicesMatcher(DeleteAction.NAME).test(index), is(false));
+            assertThat(kibanaRole.indices().allowedIndicesMatcher(UpdateSettingsAction.NAME).test(index), is(false));
+            assertThat(kibanaRole.indices().allowedIndicesMatcher(SearchAction.NAME).test(index), is(true));
+            assertThat(kibanaRole.indices().allowedIndicesMatcher(MultiSearchAction.NAME).test(index), is(true));
+            assertThat(kibanaRole.indices().allowedIndicesMatcher(GetAction.NAME).test(index), is(true));
+            assertThat(kibanaRole.indices().allowedIndicesMatcher(READ_CROSS_CLUSTER_NAME).test(index), is(true));
+        });
+
         // Beats management index
         final String index = ".management-beats";
         assertThat(kibanaRole.indices().allowedIndicesMatcher("indices:foo").test(index), is(false));