diff --git a/code/__DEFINES/tgs.dm b/code/__DEFINES/tgs.dm
index 4766b3dfe6..42f2d5fc31 100644
--- a/code/__DEFINES/tgs.dm
+++ b/code/__DEFINES/tgs.dm
@@ -1,7 +1,7 @@
 // tgstation-server DMAPI
 // The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in IETF RFC 2119.
 
-#define TGS_DMAPI_VERSION "7.2.1"
+#define TGS_DMAPI_VERSION "7.3.0"
 
 // All functions and datums outside this document are subject to change with any version and should not be relied on.
 
diff --git a/code/modules/tgs/v5/__interop_version.dm b/code/modules/tgs/v5/__interop_version.dm
index f4806f7adb..29ea239ad8 100644
--- a/code/modules/tgs/v5/__interop_version.dm
+++ b/code/modules/tgs/v5/__interop_version.dm
@@ -1 +1 @@
-"5.9.0"
+"5.10.0"
diff --git a/code/modules/tgs/v5/_defines.dm b/code/modules/tgs/v5/_defines.dm
index 92c7a8388a..a47bfd7800 100644
--- a/code/modules/tgs/v5/_defines.dm
+++ b/code/modules/tgs/v5/_defines.dm
@@ -95,6 +95,7 @@
 #define DMAPI5_TOPIC_PARAMETER_NEW_SERVER_VERSION "newServerVersion"
 #define DMAPI5_TOPIC_PARAMETER_BROADCAST_MESSAGE "broadcastMessage"
 
+#define DMAPI5_TOPIC_RESPONSE_CLIENT_COUNT "clientCount"
 #define DMAPI5_TOPIC_RESPONSE_COMMAND_RESPONSE "commandResponse"
 #define DMAPI5_TOPIC_RESPONSE_COMMAND_RESPONSE_MESSAGE "commandResponseMessage"
 #define DMAPI5_TOPIC_RESPONSE_CHAT_RESPONSES "chatResponses"
diff --git a/code/modules/tgs/v5/topic.dm b/code/modules/tgs/v5/topic.dm
index e1f2cb6385..59e5e63e5c 100644
--- a/code/modules/tgs/v5/topic.dm
+++ b/code/modules/tgs/v5/topic.dm
@@ -149,7 +149,9 @@
 		if(DMAPI5_TOPIC_COMMAND_HEALTHCHECK)
 			if(event_handler && event_handler.receive_health_checks)
 				event_handler.HandleEvent(TGS_EVENT_HEALTH_CHECK)
-			return TopicResponse()
+			var/list/health_check_response = TopicResponse()
+			health_check_response[DMAPI5_TOPIC_RESPONSE_CLIENT_COUNT] = TGS_CLIENT_COUNT
+			return health_check_response;
 
 		if(DMAPI5_TOPIC_COMMAND_WATCHDOG_REATTACH)
 			detached = FALSE
diff --git a/code/modules/tgs/v5/undefs.dm b/code/modules/tgs/v5/undefs.dm
index 237207fdfd..acd19dfa64 100644
--- a/code/modules/tgs/v5/undefs.dm
+++ b/code/modules/tgs/v5/undefs.dm
@@ -18,7 +18,6 @@
 
 #undef DMAPI5_PARAMETER_ACCESS_IDENTIFIER
 #undef DMAPI5_PARAMETER_CUSTOM_COMMANDS
-#undef DMAPI5_PARAMETER_TOPIC_PORT
 
 #undef DMAPI5_CHUNK
 #undef DMAPI5_CHUNK_PAYLOAD
@@ -95,6 +94,7 @@
 #undef DMAPI5_TOPIC_PARAMETER_NEW_SERVER_VERSION
 #undef DMAPI5_TOPIC_PARAMETER_BROADCAST_MESSAGE
 
+#undef DMAPI5_TOPIC_RESPONSE_CLIENT_COUNT
 #undef DMAPI5_TOPIC_RESPONSE_COMMAND_RESPONSE
 #undef DMAPI5_TOPIC_RESPONSE_COMMAND_RESPONSE_MESSAGE
 #undef DMAPI5_TOPIC_RESPONSE_CHAT_RESPONSES