How do I resolve the “extra_float_digits” error when using PgBouncer with a PostgreSQL datasource?

You may see the healthcheck fail for a PostgreSQL datasource configured with the PgBouncer port with this error message:

Server responded with an error: FATAL 08P01 unsupported startup parameter: extra_float_digits

This error can be resolved by modifying the PgBouncer config and enabling: 

ignore_startup_parameters = extra_float_digits

Please refer to this GitHub issue for additional information:

https://github.com/lib/pq/issues/475