InitQueueMetrics to initialize queue metrics.

InitSchedulerMetrics to initialize scheduler metrics.

EventSubsystem - subsystem name used by event cache.

MetricNameInvalidByteReplacement byte used to replace invalid bytes in prometheus metric names.

Namespace for all metrics inside the scheduler.

SchedulerSubsystem - subsystem name used by scheduler.

QueueMetrics to declare queue metrics.

SchedulerMetrics to declare scheduler metrics.