fix: listener func issue

fix: add libraries missing in otp 27 alpine image

test: logs

test: add logs

test: add debug logs

chore: vm args via env

feat: export offline messages metric

fix: username pass support for sentinel conn

fix: username pass support for sentinel conn

chore: add metrics plus plugin schema import (#67)

* chore: add metrics plus plugin schema import

* add backend client reload interval config