postgresql 9.4 restart

[Julie Nishimura <juliezain@xxxxxxxxxxx>]

Hello,

Our staging 9.4 postgresql has been running couple of weeks with no problem, but yesterday we saw this error from one of our services that connects to the staging DBs:

FATAL: terminating connection due to

administrator command; nested exception is
org.postgresql.util.PSQLException: FATAL: terminating connection due to
administrator command”,

Then I could see that postgresql got restarted, based on the output of "select pg_postmaster_start_time()"

We are running postgresql on

Linux xxx-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

How I can find out what cause the restart? Any ideas are welcome. Thanks!

-Julie N