Todd Lipcon commented on KUDU-2497:

In addition, are the existing logs relatively clear about the type of 
unauthenticated connection? eg do we differentiate between "client had no creds 
at all" vs "client had an authn token that was expired"? Would be good to 
separate out the metric by type as well.

> Add a metric for the number of unauthenticated connection attempts
> ------------------------------------------------------------------
>                 Key: KUDU-2497
>                 URL: https://issues.apache.org/jira/browse/KUDU-2497
>             Project: Kudu
>          Issue Type: Improvement
>          Components: security, server
>            Reporter: Andrew Wong
>            Priority: Major
> When a client's authentication token expires, upon connecting to a master or 
> tserver, the result is that the Kudu server logs a warning message about an 
> unauthenticated connection attempt. It would be nice if these connections 
> were quantified as a metric instead, particularly in cases where there are a 
> large number of these messages.
> Note: this would be particularly helpful when users are using older versions 
> of the Java client, that may not reauthenticate automatically, leading to a 
> huge amount of warning messages in the logs.

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