Add thread_groups to server status result (#12506)

* Add thread_groups to server status result

* update autest expected output

Author: cmcfarlen

src/mgmt/rpc/handlers/server/Server.cc

@@ -19,6 +19,7 @@
 */
 
 #include "../../../../iocore/cache/P_CacheDir.h"
+#include "iocore/eventsystem/EventProcessor.h"
 #include "iocore/net/ConnectionTracker.h"
 #include "mgmt/rpc/handlers/server/Server.h"
 #include "mgmt/rpc/handlers/common/ErrorUtils.h"
@@ -194,6 +195,19 @@ get_server_status(std::string_view const & /* params ATS_UNUSED */, YAML::Node c
     data["is_draining"]                = bts(TSSystemState::is_draining());
     data["is_event_system_shut_down"]  = bts(TSSystemState::is_event_system_shut_down());
 
+    YAML::Node threads;
+    for (const auto &tgs : eventProcessor.thread_group) {
+      if (!tgs._name.empty()) {
+        YAML::Node grp;
+        grp["name"]    = tgs._name;
+        grp["count"]   = YAML::Node(tgs._count).Scalar();
+        grp["started"] = bts(tgs._started.load());
+        threads.push_back(grp);
+      }
+    }
+
+    data["thread_groups"] = threads;
+
     resp.result()["data"] = data;
 
   } catch (std::exception const &ex) {

tests/gold_tests/traffic_ctl/traffic_ctl_server_output.test.py

@@ -34,14 +34,14 @@
 ######
 # traffic_ctl server status
 traffic_ctl.server().status().validate_with_text(
-    '{"initialized_done": "true", "is_ssl_handshaking_stopped": "false", "is_draining": "false", "is_event_system_shut_down": "false"}'
+    '{"initialized_done": "true", "is_ssl_handshaking_stopped": "false", "is_draining": "false", "is_event_system_shut_down": "false", "thread_groups": [{"name": "ET_NET", "count": "4", "started": "true"}, {"name": "ET_TASK", "count": "2", "started": "true"}, {"name": "ET_UDP", "count": "0", "started": "false"}]}'
 )
 # Drain ats so we can check the output.
 traffic_ctl.server().drain().exec()
 
 # After the drain, server status should reflect this change.
 traffic_ctl.server().status().validate_with_text(
-    '{"initialized_done": "true", "is_ssl_handshaking_stopped": "false", "is_draining": "true", "is_event_system_shut_down": "false"}'
+    '{"initialized_done": "true", "is_ssl_handshaking_stopped": "false", "is_draining": "true", "is_event_system_shut_down": "false", "thread_groups": [{"name": "ET_NET", "count": "4", "started": "true"}, {"name": "ET_TASK", "count": "2", "started": "true"}, {"name": "ET_UDP", "count": "0", "started": "false"}]}'
 )
 
 # Get basic and empty connection tracker info.