Behavior changes:

• The meaning of [tools.simple_logger]fast_flush has been changed to Whether to flush logs every second rather than flush on every log.
• All configs in section [tools.screen_logger] have been removed.
• The log severity level leading character in logs F (Fatal) is changed to C (Critical)
• Symlink to the current log file is removed.
• Log file name is changed from yyyyMMdd_hhmmss_SSS to log.[d+]*.txt
• Log content is changed:
  • The nanoseconds timestamp is removed, it's not necessary and may cause performance issue.
  • The new print thread id can be found by ps -T command, it's helpful for debugging.
  • For example, from I2024-08-01 19:45:16.8 (1722512716008970768 1c65af) replica.replica18.0200656f0072d04f: replica_stub.cpp:1303:on_group_check(): <message> to I2024-08-01 12:01:24.710 53193 replica.replica1.216400909301791341 replica_stub.cpp:1115:on_group_check(): <message>
• Rotate files algorithm changed, for example:

  log.txt -> log.1.txt
  log.1.txt -> log.2.txt
  log.2.txt -> log.3.txt
  log.3.txt -> delete
  

Performance:
The LoggingTest.SimpleBenchmark shows that it can reduce about 50% time cost when
set logging_test_simple_benchmark_loops to 1,000,000.