GetMainProcesses returns array with all running processes pids and main process pid which metrics collector is waiting.

WaitMainProcesses holds metrics collector parser until required pids are finished.

WaitPIDs waits until all pids are finished.

DefaultFilter is the default metrics collector filter to parse the metrics.

DefaultPollInterval is the default value for interval between running processes check.

DefaultTimeout is the default value for timeout before invoke error during running processes check To run without timeout set value to 0.

DefaultWaitAll is the default value whether wait for all other main process of container exiting.

TODO (andreyvelich): Do we need to maintain 2 names? Should we leave only 1?.

TrainingCompleted is the job finished marker in $$$$.pid file when main training process is completed.

TrainingEarlyStopped is the job finished marker in $$$$.pid file when main training process is early stopped.

WaitPidsOpts is the input options for metrics collector.