Postgres log files not rotating

I have a postgres system with a hot standby server. They use the same config file. I've setup the log rotation to use log_rotation_size and log_rotation_age so that the master server is rotated every 10MB and the standby logs are rotated every day.
My parameters are as follows:

```
postgres=# select name,setting,unit from pg_settings where name like '%log%';
name | setting | unit
-----------------------------+--------------------------------+------
log_autovacuum_min_duration | -1 | ms
log_checkpoints | on |
log_connections | on |
log_destination | stderr |
log_directory | /apps/postgres/pg_log |
log_disconnections | on |
log_duration | off |
log_error_verbosity | default |
log_executor_stats | off |
log_file_mode | 0600 |
log_filename | postgresql-%Y-%m-%d_%H%M%S.log |
log_hostname | on |
log_line_prefix | %u %h %p |
log_lock_waits | on |
log_min_duration_statement | 10000 | ms
log_min_error_statement | error |
log_min_messages | warning |
log_parser_stats | off |
log_planner_stats | off |
log_rotation_age | 1440 | min
log_rotation_size | 10240 | kB
log_statement | ddl |
log_statement_stats | off |
log_temp_fil

Try the following log parameters. After modify them, remember to reload the configuration file ($PGDATA/postgresql.conf).

# These are only used if logging_collector is on:
log_directory = '/var/applog/pg_log/1921'               # directory where log files are written,
                                        # can be absolute or relative to PGDATA
log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log' # log file name pattern,
                                        # can include strftime() escapes
log_file_mode = 0600                    # creation mode for log files,
                                        # begin with 0 to use octal notation
log_truncate_on_rotation = on           # If on, an existing log file with the
                                        # same name as the new log file will be
                                        # truncated rather than appended to.
                                        # But such truncation only occurs on
                                        # time-driven rotation, not on restarts
                                        # or size-driven rotation.  Default is
                                        # off, meaning append to existing files
                                        # in all cases.
log_rotation_age = 1d                  # Automatic rotation of logfiles will
                                        # happen after that time.  0 disables.
log_rotation_size = 10MB               # Automatic rotation of logfiles will

StackExchange Database Administrators Q#53097, answer score: 4