fix telegraf data format

telegraf.py

@@ -15,8 +15,8 @@ LOG = logging.getLogger(__name__)
 
 def out(keys, value):
     print(
-        "{},{} value={}".format(
+        "sdm630,identifier={},{} value={}".format(
-            config["telegraf"]["measurement"],
+            config["telegraf"]["identifier"],
             ",".join([f"{k}={v}" for k, v in keys.items()]),
             value,
         ),