How to exclude the zero matrics?

Hi,I want to let the exporter do not return the zero matrics,because my matrics is too large.
For example I want to exclude these matrics of zero value:
pg_locks_count{datname="check_split_10c67626617311eda61d0025908bebb9",mode="accessexclusivelock",server="10.93.50.47:5432"} 0 pg_locks_count{datname="check_split_10c67626617311eda61d0025908bebb9",mode="accesssharelock",server="10.93.50.47:5432"} 0 pg_locks_count{datname="check_split_10c67626617311eda61d0025908bebb9",mode="exclusivelock",server="10.93.50.47:5432"} 0 pg_locks_count{datname="check_split_10c67626617311eda61d0025908bebb9",mode="rowexclusivelock",server="10.93.50.47:5432"} 3 pg_locks_count{datname="check_split_10c67626617311eda61d0025908bebb9",mode="rowsharelock",server="10.93.50.47:5432"} 2 pg_locks_count{datname="check_split_10c67626617311eda61d0025908bebb9",mode="sharelock",server="10.93.50.47:5432"} 1

No implementation files, tests, or entry points are named in the issue. Start by locating where PostgreSQL lock metrics are collected and rendered by the exporter, then determine whether zero-valued series can be excluded without affecting metric semantics. Done means the exporter omits the requested zero-valued metrics while retaining nonzero series, with coverage for the example behavior.