SIP Worker Pool Statistics

…​threads in the worker pool.

…​when the worker pool starts a new thread to handle incoming work.

…​when a worker thread terminates because it is no longer needed.

gauge

…​threads in the pool that are idle and available for work.

…​when a worker thread finishes its current task and begins waiting for more work.

…​when a worker thread begins processing a new task.

gauge

…​tasks waiting in the worker pool’s queue.

…​when a task is enqueued and there is no worker thread immediately available to process it.

…​when a worker thread removes a task from the queue.

gauge

…​tasks rejected because the queue was full.

…​when a task is unable to be enqueued because there is no space in the queue.

…​never.

delta

…​times that network reads were suspended.

…​when the stack stops reading from a TCP socket because there is no space in the queue.

…​never.

delta

…​times that network reads were resumed.

…​when the stack resumes reading from a TCP socket because the queue is no longer full.

…​never.

delta

…​time spent by the SIP stack processing a message.

From the time the worker thread begins processing the message…​ to the time the message is handed off to a higher layer (the SIS).

…​the total time for the SIP stack to parse a message, update transaction state and pass the message up to the SIS.

…​time spent by tasks waiting in the queue.

From the a task is placed on the queue…​ to the time the task is removed by a worker thread.

…​the time spent waiting on the queue because no threads were available.