manager: log exit reason (#23532)

selfdrive/common/params.cc

@@ -131,6 +131,7 @@ std::unordered_map<std::string, uint32_t> keys = {
     {"JoystickDebugMode", CLEAR_ON_MANAGER_START | CLEAR_ON_IGNITION_OFF},
     {"LastAthenaPingTime", CLEAR_ON_MANAGER_START},
     {"LastGPSPosition", PERSISTENT},
+    {"LastManagerExitReason", CLEAR_ON_MANAGER_START},
     {"LastPeripheralPandaType", PERSISTENT},
     {"LastPowerDropDetected", CLEAR_ON_MANAGER_START},
     {"LastSystemShutdown", CLEAR_ON_MANAGER_START},

selfdrive/manager/manager.py

@@ -166,8 +166,9 @@ def manager_thread() -> None:
     shutdown = False
     for param in ("DoUninstall", "DoShutdown", "DoReboot"):
       if params.get_bool(param):
-        cloudlog.warning(f"Shutting down manager - {param} set")
         shutdown = True
+        params.put("LastManagerExitReason", param)
+        cloudlog.warning(f"Shutting down manager - {param} set")
 
     if shutdown:
       break