pg_stat_activity_count is 0

Could you give me some advice for this problem? Thanks
My metrics is 0，for example: the pg_stat_activity_count as follows:
pg_stat_activity_count{datname="check_split_004123145c2d11edb9110025908bebf4",server="0.0.0.0:5432",state="active"} 0 pg_stat_activity_count{datname="check_split_004123145c2d11edb9110025908bebf4",server="0.0.0.0:5432",state="disabled"} 0 pg_stat_activity_count{datname="check_split_004123145c2d11edb9110025908bebf4",server="0.0.0.0:5432",state="fastpath function call"} 0 pg_stat_activity_count{datname="check_split_004123145c2d11edb9110025908bebf4",server="0.0.0.0:5432",state="idle"} 0 pg_stat_activity_count{datname="check_split_004123145c2d11edb9110025908bebf4",server="0.0.0.0:5432",state="idle in transaction"} 0 pg_stat_activity_count{datname="check_split_004123145c2d11edb9110025908bebf4",server="0.0.0.0:5432",state="idle in transaction (aborted)"} 0 pg_stat_activity_count{datname="check_split_076881c45b7311edb4d2002590f91981",server="0.0.0.0:5432",state="active"} 0 pg_stat_activity_count{datname="check_split_076881c45b7311edb4d2002590f91981",server="0.0.0.0:5432",state="disabled"} 0 pg_stat_activity_count{datname="check_split_076881c45b7311edb4d2002590f91981",server="0.0.0.0:5432",state="fastpath function call"} 0 pg_stat_activity_count{datname="check_split_076881c45b7311edb4d2002590f91981",server="0.0.0.0:5432",state="idle"} 0 pg_stat_activity_count{datname="check_split_076881c45b7311edb4d2002590f91981",server="0.0.0.0:5432",state="idle in transaction"} 0 pg_stat_activity_count{datname="check_split_076881c45b7311edb4d2002590f91981",server="0.0.0.0:5432",state="idle in transaction (aborted)"} 0 pg_stat_activity_count{datname="check_split_0a18ba8c5c1411edacd90025908bebb9",server="0.0.0.0:5432",state="active"} 0 pg_stat_activity_count{datname="check_split_0a18ba8c5c1411edacd90025908bebb9",server="0.0.0.0:5432",state="disabled"} 0 pg_stat_activity_count{datname="check_split_0a18ba8c5c1411edacd90025908bebb9",server="0.0.0.0:5432",state="fastpath function call"} 0 pg_stat_activity_count{datname="check_split_0a18ba8c5c1411edacd90025908bebb9",server="0.0.0.0:5432",state="idle"} 0 pg_stat_activity_count{datname="postgres",server="0.0.0.0:5432",state="active"} 2 pg_stat_activity_count{datname="postgres",server="0.0.0.0:5432",state="disabled"} 0 pg_stat_activity_count{datname="postgres",server="0.0.0.0:5432",state="fastpath function call"} 0 pg_stat_activity_count{datname="postgres",server="0.0.0.0:5432",state="idle"} 0 pg_stat_activity_count{datname="postgres",server="0.0.0.0:5432",state="idle in transaction"} 0 pg_stat_activity_count{datname="postgres",server="0.0.0.0:5432",state="idle in transaction (aborted)"} 0

This is the actual number of connections to my database
ps -ef| grep postgres |wc -l 179

No files, tests, versions, or configuration are named. Start by comparing the exporter’s pg_stat_activity_count output with the PostgreSQL connection count and gather the exporter and PostgreSQL versions. Done means identifying why the exporter reports zeros for most databases and documenting a reproducible cause or correction.