```/counter/fetched_callbacks``` - The total number of fetched callbacks<br>
```/counter/current_messages``` - The current number of callback messages waiting to be fetched<br>
All counters also support the query parameter "id" to fetch counter for one individual id, eg ```/counter/current_messages?id=my-id```
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+An additional counter is available to log remote hosts calling the server
+```/counter/remote_hosts``` - Lists all unique ip/host name that has sent messages on the callback endpoint<br>
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