PMM-13166: Ability to monitor DBs from a different node

public/app/percona/add-instance/components/AddRemoteInstance/AddRemoteInstance.service.test.tsx

@@ -68,6 +68,10 @@ describe('AddRemoteInstanceService:: ', () => {
       pmm_agent_id: {
         value: 'pmm-server',
       },
+      node: {
+        value: 'node1',
+        label: 'node1',
+      },
     };
 
     const payload = {
@@ -94,7 +98,8 @@ describe('AddRemoteInstanceService:: ', () => {
       pmm_agent_id: 'pmm-server',
       port: '80',
       qan_postgresql_pgstatements_agent: true,
-      metrics_mode: 1,
+      metrics_mode: 2,
+      node_id: 'node1',
     };
     expect(toPayload(data)).toStrictEqual(payload);
   });

public/app/percona/add-instance/components/AddRemoteInstance/AddRemoteInstance.service.tsx

@@ -1,5 +1,6 @@
 import { CancelToken } from 'axios';
 
+import { PMM_SERVER_NODE_AGENT_ID } from 'app/percona/add-instance/components/AddRemoteInstance/FormParts/NodesAgents/NodesAgents.constants';
 import { Databases } from 'app/percona/shared/core';
 import { apiManagement } from 'app/percona/shared/helpers/api';
 
@@ -142,13 +143,20 @@ export const toPayload = (values: any, discoverName?: string, type?: InstanceAva
     data.service_name = data.address;
   }
 
-  if (!values.isAzure && data.add_node === undefined) {
+  if (
+    (!values.isAzure && data.add_node === undefined) ||
+    (data.address !== '127.0.0.1' && data.address !== 'localhost')
+  ) {
     data.add_node = {
       node_name: data.service_name,
       node_type: 'NODE_TYPE_REMOTE_NODE',
     };
   }
 
+  if (data.address === '127.0.0.1' || data.address === 'localhost') {
+    data.node_id = data.node.value;
+  }
+
   if (values.isRDS && discoverName) {
     data.engine = discoverName;
   }
@@ -181,7 +189,11 @@ export const toPayload = (values: any, discoverName?: string, type?: InstanceAva
 
   data.pmm_agent_id = values.pmm_agent_id.value;
 
-  data.metrics_mode = 1;
+  if (data.pmm_agent_id === PMM_SERVER_NODE_AGENT_ID) {
+    data.metrics_mode = 2;
+  } else {
+    data.metrics_mode = 1;
+  }
   delete data.tracking;
   delete data.node;