tracer-kronos too verbose at INFO level
Motivation
----------

It outputs tens of millions of messages per day. Most of them with the following useless content: 
```
2022-05-16 13:59:17,294	root	1	INFO	kronos-file[1/4] updated 1 replica(s)
```

Modification
------------
Substitute this message with a counter.


diff --git a/lib/rucio/daemons/tracer/kronos.py b/lib/rucio/daemons/tracer/kronos.py
index 391a19330..0da10c9b0 100644
--- a/lib/rucio/daemons/tracer/kronos.py
+++ b/lib/rucio/daemons/tracer/kronos.py
@@ -294,7 +294,8 @@ class AMQConsumer(object):
             self.__logger(logging.ERROR, "Cannot update replicas.", exc_info=True)
             record_counter('daemons.tracer.kronos.update_error')
 
-        self.__logger(logging.INFO, 'updated %d replica(s)' % len(replicas))
+        record_counter('daemons.tracer.kronos.updated_replicas')
+        self.__logger(logging.DEBUG, 'updated %d replica(s)' % len(replicas))
 
 
 def kronos_file(thread=0, dataset_queue=None, sleep_time=60):
['lib/rucio/daemons/tracer/kronos.py']