In our devsuite test environment we are having the entire suite of applications crash. Contigix has investigated and they see that

It looks like the crowd instance is having some trouble:

@40000000474e038a07c7b4f4 18:10:40,130 WARN
org.hibernate.util.JDBCExceptionReporter: SQL Error: 0, SQLState: 23505
@40000000474e038a07c981e4 18:10:40,130 ERROR
org.hibernate.util.JDBCExceptionReporter: ERROR: duplicate key violates
unique constraint "TOKEN_KEY_key"
@40000000474e038a07fcceb4 18:10:40,130 ERROR
org.hibernate.event.def.AbstractFlushingEventListener: Could not
synchronize database state with session
@40000000474e038a07fcde54
org.hibernate.exception.ConstraintViolationException: could not insert:
[com.atlassian.crowd.model.token.Token]

With this, the applications are attempting to connect internally, using
up all the apache threads available. This is the underlying issue
causing the outage.

They took a thread dump before they cleared the error. I am attaching it.