[show priority-group drop counters] Remove backup with cached PG drop counters after 'config reload'

config/main.py

@@ -1214,6 +1214,11 @@ def reload(db, filename, yes, load_sysinfo, no_service_restart, disable_arp_cach
     if multi_asic.is_multi_asic():
         num_cfg_file += num_asic
 
+    # Remove cached PG drop counters data
+    dropstat_dir_prefix = '/tmp/dropstat'
+    command = "rm -rf {}-*".format(dropstat_dir_prefix)
+    clicommon.run_command(command, display_cmd=True)
+
     # If the user give the filename[s], extract the file names.
     if filename is not None:
         cfg_files = filename.split(',')

tests/pgdropstat_test.py

@@ -3,6 +3,7 @@
 
 import show.main as show
 import clear.main as clear
+import config.main as config
 
 from click.testing import CliRunner
 
@@ -62,6 +63,20 @@ def executor(self, clear_before_show):
         assert result.exit_code == 0
         assert result.output == show_output
 
+    def test_show_pg_drop_config_reload(self):
+        runner = CliRunner()
+        self.test_show_pg_drop_clear()
+
+        # simulate 'config reload' to provoke counters recalculation (remove  backup from /tmp folder)
+        result = runner.invoke(config.config.commands["reload"], [ "--no_service_restart",  "-y"])
+
+        print(result.exit_code)
+        print(result.output)
+
+        assert result.exit_code == 0
+
+        self.test_show_pg_drop_show()
+
     @classmethod
     def teardown_class(cls):
         os.environ["PATH"] = os.pathsep.join(os.environ["PATH"].split(os.pathsep)[:-1])