Added it. Now I have a question regarding these lines:
"SELECT count(*) stanby FROM pg_catalog.pg_stat_replication
{ _T("PostgreSQL.Replication.Stanby(*)"), H_GlobalParameter, _T("REPLICATION/stanby"), DCI_DT_INT64, _T("PostgreSQL/Replication: WAL senders") },
shouldn't it be "standby"? Or even "PostgreSQL.Replication.WALSenders"?
I don't know meaning of this parameter, question is based purely on name and description difference

Best regards,
Victor