I deployed 1.3.1 yesterday on a HA setup and ran twice into the same issue that caused a halt on both instances at different times.
It looks like a race condition when retrieving tag values and writing new tags. These are ephemeral time series, in the order of 20000 new unique tags per day.
The error I am seeing is: fatal error: concurrent map iteration and map write.
I switched back to the inmem setting for the index version. I never saw this issue with the inmem setting and version 1.2.1.
Thanks for having a look.