Merge pull request ceph#15668 from Liuchang0812/wip-fix-mgr-dashboard

mgr/dashboard: fix type error in get_rate function

Reviewed-by: Sage Weil <[email protected]>

src/pybind/mgr/dashboard/module.py

@@ -610,7 +610,7 @@ def _health(self):
 
                     def get_rate(series):
                         if len(series) >= 2:
-                            return (series[0][1] - series[1][1]) / float(series[0][0] - series[1][0])
+                            return (float(series[0][1]) - float(series[1][1])) / (float(series[0][0]) - float(series[1][0]))
                         else:
                             return 0