Use supported manager reload option

src/apps/config/tests/test_cli.py

@@ -66,6 +66,16 @@ def configurations():
 
 
 class ConfigurationCliTest(unittest.TestCase):
+    def test_manager_reload_uses_supported_short_option(self):
+        completed = mock.Mock(returncode=0)
+        with mock.patch.object(cli, "_manager_binary",
+                               return_value=Path("/usr/sbin/bongo-manager")), \
+                mock.patch.object(cli.subprocess, "run",
+                                  return_value=completed) as run:
+            cli._reload_manager()
+        run.assert_called_once_with(
+            ["/usr/sbin/bongo-manager", "-r"], check=False, timeout=120)
+
     def test_verified_scanner_activation_is_saved_before_manager_reload(self):
         store = FakeStore()
         original = configurations()

src/apps/manager/manager.c

@@ -1811,7 +1811,7 @@ ShowHelp(void)
            "\t-k: Keep agents alive, restarting them after crashes.\n"
            "\t-f: Force start, replacing " LOCKFILE ".\n"
            "\t-s: Shut down an already-running bongo-manager.\n"
-           "\t-r: Ask a running bongo-manager to restart stopped agents.\n")
+           "\t-r: Synchronize configuration and restart stopped agents.\n")
         );
     
 }

src/libs/python/bongo/configuration/cli.py

@@ -60,7 +60,7 @@ def _reload_manager() -> None:
     manager = _manager_binary()
     try:
         completed = subprocess.run(
-            [str(manager), "--reload"], check=False, timeout=120)
+            [str(manager), "-r"], check=False, timeout=120)
     except (OSError, subprocess.TimeoutExpired) as error:
         raise ConfigurationError(
             f"cannot request Bongo manager reload: {error}") from error