In some environments, there can be multiple instances of a process running, for example, the Sentinel Control Center or Sentinel Collector Manager. In this case, the first instance’s log files are named as, for example, collector_mgr0.0.log. The second instance substitutes a 1 for the first 0 in the log file name, for example, collector_mgr1.0.log.
If other processes have log files for more than one instance running, that could indicate a system problem.