Latest version requires pgpool >= v4.2

[reoops]

README.md states that pgpool >= v3.6 is required. Seems to require pgpool >= v4.2.

After building and starting I got back following error message (and yes I access pgpool2 not postgresql directly):

pgpool --version
pgpool-II version 4.1.4 (karasukiboshi)

DATA_SOURCE_NAME="postgresql://user:passs@host/postgres?sslmode=disable" ./pgpool2_exporter 
INFO[0000] Error running query on database:  pool_backend_stats pq: unrecognized configuration parameter "pool_backend_stats"  source="pgpool2_exporter.go:451"
INFO[0000] Error running query on database:  pool_health_check_stats pq: unrecognized configuration parameter "pool_health_check_stats"  source="pgpool2_exporter.go:451"
FATA[0000] map[pool_backend_stats:Error running query on database:  pool_backend_stats pq: unrecognized configuration parameter "pool_backend_stats"
 pool_health_check_stats:Error running query on database:  pool_health_check_stats pq: unrecognized configuration parameter "pool_health_check_stats"
]  source="pgpool2_exporter.go:543"

Here the workaround for older versions:

git checkout d1a6e457a8abbdd62b8601e59d9180b8a00e10bb
go mod tidy
go mod vendor
make

Please detect version or at least update the README.

[pengbo0328]

Thank you for reporting this issue.

I am going to fix this issue to support old versions (e.g. 4.1.x).

[pengbo0328]

I have fixed this issue.
Now Pgpool-II exporter is able to detect Pgpool-II version.

commit

[reoops]

Thank you very much. Works like a charm.