elstat.adapters: only log on errors

always logging was giving quite the disk usage on prod.

elstat/adapters.py

@@ -66,12 +66,13 @@ class PingAdapter(Adapter):
         else:
             latency = 0
 
-        worker.log.info(f'alive={alive} latency={latency}ms')
-
         if alive:
             # we dont need to keep sending err_msg on alive scenarios
             return cls._construct(alive, latency)
 
+        # only log on errors
+        worker.log.info(f'alive={alive} latency={latency}ms')
+
         err = PING_ERROR_RGX.search(out)
         err_msg = err.group(2) if not alive and err else 'packet lost'
 
@@ -110,9 +111,11 @@ class HttpAdapter(Adapter):
         # drop latency to 0 to signal a non-success
         latency = latency if succ else 0
 
-        worker.log.info(f'status={resp.status} latency={latency}ms')
-
         if not succ:
+            # only log on errors
+            worker.log.info(f'status={resp.status} latency={latency}ms')
+
+            # construct error message from http error code
             status_phrase = cls.get_phrase(resp.status)
             err_str = f'http status {resp.status} - {status_phrase}'
             return cls._construct(succ, latency, err_str)