Metric label values truncated when using OpenMetrics endpoint

Hi,

Recently we upgraded to Dovecot 2.3.11.3 and configured an example metric like this:

metric imap_command { event_name = imap_command_finished group_by = cmd_name tagged_reply_state user remote_ip }

And enabled the OpenMetrics listener like this:

service stats { inet_listener http { port = 5000 } }

While the result is great, I noticed that some metrics are being truncated (three dots at the end of the label value):

dovecot_imap_command_duration_usecs_sum{cmd_name="FETCH",tagged_reply_state="OK",user="xxxxxxxxxxx.inbox@xxxxxxxxxxxxx…",remote_ip="XXXX:XXXX:XXXX:XXXX:cc6b:cc7a:d…"} 2346 1598055662473

I couldn't find this information in the documentation so I'm wondering if this is a bug.

Thank you for your time.

Regards, Daan