PMM-12913 migrate /v1/inventory/Agents/Get

Author: ademidoff

api-tests/management/helpers.go

@@ -97,9 +97,7 @@ func assertPMMAgentCreated(t pmmapitests.TestingT, nodeID string, pmmAgentID str
 	t.Helper()
 
 	agentOK, err := inventoryClient.Default.AgentsService.GetAgent(&agents.GetAgentParams{
-		Body: agents.GetAgentBody{
-			AgentID: pmmAgentID,
-		},
+		AgentID: pmmAgentID,
 		Context: pmmapitests.Context,
 	})
 	assert.NoError(t, err)

api/MIGRATION_TO_V3.md

@@ -23,7 +23,7 @@ POST /v1/user/list                                  GET /v1/users
 **AgentsService**                                   **AgentsService**
 POST /v1/inventory/Agents/Add                       POST /v1/inventory/agents                        ✅
 POST /v1/inventory/Agents/Change                    PUT /v1/inventory/agents/{id}                    ✅
-POST /v1/inventory/Agents/Get                       GET /v1/inventory/agents/{id}
+POST /v1/inventory/Agents/Get                       GET /v1/inventory/agents/{id}                    ✅
 POST /v1/inventory/Agents/List                      GET /v1/inventory/agents
 POST /v1/inventory/Agents/Remove                    DELETE /v1/inventory/agents/{id}
 POST /v1/inventory/Agents/GetLogs                   GET /v1/inventory/agents/{id}/logs            

api/inventory/v1/agents.pb.go

@@ -617,7 +617,7 @@ message ListAgentsResponse {
 
 message GetAgentRequest {
   // Unique randomly generated instance identifier.
-  string agent_id = 1 [(validate.rules).string.min_len = 1];
+  string agent_id = 1 [(validate.rules).string.min_len = 36];
 }
 
 message GetAgentResponse {
@@ -644,7 +644,7 @@ message GetAgentResponse {
 
 message GetAgentLogsRequest {
   // Unique randomly generated instance identifier.
-  string agent_id = 1 [(validate.rules).string.min_len = 1];
+  string agent_id = 1 [(validate.rules).string.min_len = 36];
   // is less than this value. 0: no limit
   uint32 limit = 2;
 }
@@ -697,7 +697,7 @@ message AddAgentResponse {
 }
 
 message ChangeAgentRequest {
-  string agent_id = 1 [(validate.rules).string.min_len = 36];
+  string agent_id = 1 [(validate.rules).string.min_len = 1];
 
   oneof agent {
     // ChangePMMAgentParams pmm_agent = 1;
@@ -1325,10 +1325,7 @@ service AgentsService {
   }
   // GetAgent returns a single Agent by ID.
   rpc GetAgent(GetAgentRequest) returns (GetAgentResponse) {
-    option (google.api.http) = {
-      post: "/v1/inventory/Agents/Get"
-      body: "*"
-    };
+    option (google.api.http) = {get: "/v1/inventory/agents/{agent_id}"};
     option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
       summary: "Get Agent"
       description: "Returns a single Agent by ID."