[pgpool-general: 8916] How to identify pgpool connections to PostgreSQL

[Steeve Boulanger]

Greetings,

Question:
1) Is there a way to identify the database connections originating from
pgpool, within PostgreSQL? ie pg_stat_activity?

Use case:
we currently have a few hundreds micro-services, among which some are
connecting to pgpool, and some are still connecting directly to the
database. The ultimate goal is to have all applications connecting to
pgpool, but first, we have to fix an issue with idle connections. For this
reason, I need a way to be able to identify the pgpool vs non-pgpool
connections , from within PostgreSQL.

If there's no other way than using "show pool_pools",  then I have a couple
more questions / suggestions:

2) Is there a way to "query"  the "show pool_pools" results? In other
words, is it possible to join the "show pool_pools" results with
pg_stat_activity for example?

3) Assuming none of the above is currently possible, it would be a great
feature if we could define a prefix that could be appended to the
"appication_name" value coming from the client perhaps.
Example:
client connection:         psql -d 'dbname=postgres application_name=mypsql'
pgpool param (new):   application_name_prefix  = 'pgp-'
pg_stat_activity:           application_name shows "pgp-mypsql'

Regards,
Steeve
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