Lot of postmaster processes

Hi,

Output below is output of command

$top -c -u postgres

Can somebody tell me why there is so many postmaster running.
O/S: Rocky Linux release 9.4
pg rel: 15.10

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
2837351 postgres 20 0 6408 256 256 D 9.8 0.0 0:02.02 free
-h
2837291 postgres 20 0 235300 1536 512 R 2.5 0.0 0:03.34 top
-c -u postgres
2837352 postgres 20 0 1257200 2004 128 R 0.8 0.1 0:00.16
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2836988 postgres 20 0 1261488 15708 12168 R 0.2 0.4 0:01.01
postgres: elvnetfix_instance: elvnetfixadmin elvnetfix x.x.x.x(8497) idle
2836990 postgres 20 0 1261612 14556 11144 R 0.2 0.4 0:01.03
postgres: elvnetfix_instance: elvnetfixadmin elvnetfix x.x.x.x(12454) BEGIN
2837353 postgres 20 0 1257200 1876 0 R 0.2 0.1 0:00.05
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837356 postgres 20 0 1257200 2004 128 R 0.2 0.1 0:00.05
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837357 postgres 20 0 1257200 1876 0 R 0.2 0.1 0:00.05
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837358 postgres 20 0 1257200 1876 0 R 0.2 0.1 0:00.05
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837359 postgres 20 0 1257200 1876 0 D 0.2 0.1 0:00.05
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837361 postgres 20 0 1257200 2004 128 D 0.2 0.1 0:00.05
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837366 postgres 20 0 1257200 1876 0 R 0.2 0.1 0:00.05
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837367 postgres 20 0 1257200 2004 128 D 0.2 0.1 0:00.05
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837368 postgres 20 0 1257200 1876 0 R 0.2 0.1 0:00.05
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2836973 postgres 20 0 1257200 43904 41984 R 0.2 1.2 0:01.24
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2836976 postgres 20 0 1257340 10204 8328 R 0.2 0.3 0:00.24
postgres: elvnetfix_instance: background writer
2836983 postgres 20 0 1261148 9052 6024 R 0.2 0.2 0:00.29
postgres: elvnetfix_instance: TimescaleDB Background Worker Scheduler
2837084 postgres 20 0 1277008 82580 64392 R 0.2 2.2 0:18.62
postgres: elvnetfix_instance: postgres elvnetfix [local] ANALYZE
2837303 postgres 20 0 2111732 855128 62600 D 0.2 23.0 0:31.68
postgres: elvnetfix_instance: parallel worker for PID 2837299
2837346 postgres 20 0 1257200 2004 128 R 0.2 0.1 0:00.61
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837354 postgres 20 0 1257200 1876 0 D 0.2 0.1 0:00.04
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837355 postgres 20 0 1257200 1876 0 R 0.2 0.1 0:00.04
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837360 postgres 20 0 1257200 1876 0 D 0.2 0.1 0:00.04
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837362 postgres 20 0 1257200 1876 0 R 0.2 0.1 0:00.04
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837363 postgres 20 0 1257200 2004 128 R 0.2 0.1 0:00.04
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837364 postgres 20 0 1257200 2004 128 R 0.2 0.1 0:00.04
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837365 postgres 20 0 1257200 2004 128 R 0.2 0.1 0:00.04
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2836979 postgres 20 0 1257340 18524 16648 R 0.1 0.5 0:00.74
postgres: elvnetfix_instance: walwriter
2836980 postgres 20 0 1258796 3292 1160 R 0.1 0.1 0:00.16
postgres: elvnetfix_instance: autovacuum launcher
2836985 postgres 20 0 1261300 10204 7176 R 0.1 0.3 0:01.48
postgres: elvnetfix_instance: elvnetfixadmin elvnetfix x.x.x.x(32449) PARSE
2836986 postgres 20 0 1261544 14300 10888 D 0.1 0.4 0:00.98
postgres: elvnetfix_instance: elvnetfixadmin elvnetfix x.x.x.x(23326) idle
2836987 postgres 20 0 1261612 14428 10888 R 0.1 0.4 0:00.94
postgres: elvnetfix_instance: elvnetfixadmin elvnetfix x.x.x.x(64612) BEGIN
2836994 postgres 20 0 1259468 4444 1800 R 0.1 0.1 0:01.14
postgres: elvnetfix_instance: walsender barman x.x.x.x(57084) streaming
6AD/7575C3E8
2837130 postgres 20 0 1261536 15708 12168 R 0.1 0.4 0:00.93
postgres: elvnetfix_instance: elvnetfixadmin elvnetfix x.x.x.x(17361) idle
2837299 postgres 20 0 2195352 940340 72712 R 0.1 25.3 0:34.68
postgres: elvnetfix_instance: elvnetfixadmin elvnetfix x.x.x.x(27104) SELECT
2837345 postgres 20 0 1257200 1876 0 R 0.1 0.1 0:00.73
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837348 postgres 20 0 1257200 1876 0 R 0.1 0.1 0:00.45
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837350 postgres 20 0 1257200 2004 128 R 0.1 0.1 0:00.27
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837369 postgres 20 0 1257200 2004 128 R 0.1 0.1 0:00.03
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2837302 postgres 20 0 2111732 860004 65032 R 0.1 23.2 0:31.29
postgres: elvnetfix_instance: parallel worker for PID 2837299
2837349 postgres 20 0 1257200 1876 0 R 0.1 0.1 0:00.37
/usr/pgsql-15/bin/postmaster -D /pgdata/pgsql/15/data/
2832240 postgres 20 0 224348 2304 128 S 0.0 0.1 0:00.73 -bash
2835242 postgres 20 0 224348 2304 128 S 0.0 0.1 0:00.61 -bash
2836621 postgres 20 0 224348 2048 0 S 0.0 0.1 0:00.02 -bash
2836974 postgres 20 0 281224 1984 136 S 0.0 0.1 0:00.03
postgres: elvnetfix_instance: logger
2836975 postgres 20 0 1257356 20828 18952 S 0.0 0.6 0:00.02
postgres: elvnetfix_instance: checkpointer

br
Kaido