autoprewarm main function not tested background worker not listed in pg_stat_activity

Hi.
https://coverage.postgresql.org/contrib/pg_prewarm/autoprewarm.c.gcov.html
function autoprewarm_start_worker never gets tested, but
autoprewarm_start_worker listed in our doc
(https://www.postgresql.org/docs/16/pgprewarm.html)
Maybe we should test it.

also this part in function autoprewarm_main not tested.
247 : /* Compute the next dump time. */
248 0 : next_dump_time =
249 0 :
TimestampTzPlusMilliseconds(last_dump_time,
250 :
autoprewarm_interval * 1000);
251 : delay_in_ms =
252 0 :
TimestampDifferenceMilliseconds(GetCurrentTimestamp(),
253 :
next_dump_time);
254 :
255 : /* Perform a dump if it's time. */
256 0 : if (delay_in_ms <= 0)
257 : {
258 0 : last_dump_time = GetCurrentTimestamp();
259 0 : apw_dump_now(true, false);
260 0 : continue;
261 : }
262 :
263 : /* Sleep until the next dump time. */
264 0 : (void) WaitLatch(MyLatch,
265 : WL_LATCH_SET |
WL_TIMEOUT | WL_EXIT_ON_PM_DEATH,
266 : delay_in_ms,
267 : WAIT_EVENT_EXTENSION);

I don't fully understand this module, but I kind of get the meaning of
the worker_spi module.

i didn't configure shared_preload_libraries.
I changed from
worker.bgw_flags = BGWORKER_SHMEM_ACCESS;
to
worker.bgw_flags = BGWORKER_SHMEM_ACCESS |
BGWORKER_BACKEND_DATABASE_CONNECTION;

but still, the following query will not list the autoprewarm background worker.
SELECT datname, pid, state, backend_type, wait_event_type, wait_event
FROM pg_stat_activity;

I thought pg_stat_activity will list all related pid for this cluster.
but it seems not in this case.
So here, is it a good idea to make the autoprewarm background worker
listed in pg_stat_activity?