Wal files in /pgsql/14/main/pg_wal not removed

data_directory = '/pgsql/14/main'

hba_file = '/etc/postgresql/14/main/pg_hba.conf'

ident_file = '/etc/postgresql/14/main/pg_ident.conf'

external_pid_file = '/var/run/postgresql/14-main.pid'

unix_socket_directories = '/var/run/postgresql'

# SSL

ssl = on

ssl_cert_file = '/etc/ssl/certs/ssl-cert-snakeoil.pem'

ssl_key_file = '/etc/ssl/private/ssl-cert-snakeoil.key'

listen_addresses = '*'

port = 5432

random_page_cost = 1.1

max_connections = 400

shared_buffers = 3840MB

statement_timeout = 0

work_mem = 209719830kB

maintenance_work_mem = 960MB

shared_preload_libraries = 'pg_stat_statements'

pg_stat_statements.track = all

track_activity_query_size = 102400

synchronous_commit = off

synchronous_standby_names = '*'

wal_buffers = 16MB

wal_level = replica

# PG 14 new parameters

min_wal_size = 1GB

max_wal_size = 4GB

max_worker_processes = 2

max_parallel_workers_per_gather = 1

max_parallel_workers = 2

max_parallel_maintenance_workers = 1

# Replication parameters

max_replication_slots = 15

hot_standby_feedback = on

hot_standby = on

fsync = on

wal_keep_size = 100GB

restore_command = 'cp /data/wal_archive/%f %p'

checkpoint_completion_target = 0.9

archive_mode = on

archive_command = '/pgsql/pg-archive-wal-to-slaves.sh "%p"'

archive_timeout = 300

max_wal_senders = 50

effective_cache_size = 11520MB

logging_collector = on

log_directory = '/data/postgresql/log'

log_filename = 'postgresql.log.%a'

log_rotation_age = 1440

log_rotation_size = 0

log_truncate_on_rotation = on

log_min_duration_statement = 1000

log_line_prefix = '%t [%p]: [%l-1] user=%u,db=%d,app=%a,client=%h '

log_lock_waits = on

log_statement = 'ddl'

log_timezone = 'UTC'

stats_temp_directory = '/var/run/postgresql/main.pg_stat_tmp'

autovacuum = on

log_autovacuum_min_duration = 1000

autovacuum_max_workers = 5

autovacuum_naptime = 40s

autovacuum_vacuum_threshold = 200

autovacuum_analyze_threshold = 150

autovacuum_vacuum_scale_factor = 0.02

autovacuum_analyze_scale_factor = 0.005

datestyle = 'iso, mdy'

timezone = 'UTC'

lc_messages = 'en_US.UTF-8'

lc_monetary = 'en_US.UTF-8'

lc_numeric = 'en_US.UTF-8'

lc_time = 'en_US.UTF-8'

default_text_search_config = 'pg_catalog.english'

deadlock_timeout = 2s

max_files_per_process = 4096

effective_io_concurrency = 200

default_statistics_target = 100

# https://dba.stackexchange.com/a/280727

max_standby_streaming_delay = 30s