The monitor input cannot produce data because splunkd's processing queues are full, what do I do to solve this?

[abazgwa21cz]

I have and issues with red status :   The monitor input cannot produce data because splunkd's processing queues are full. This will be caused by inadequate indexing or forwarding rate, or a sudden burst of incoming data.

i check in Indexing Performance: Instance and almost field had 100% 

and when i check CPU and memory used and license used it had alot space 

 so how can i find the issues and can i fix this problem 

   

[PickleRick]

The logical thing to do would be to check your IO saturation.

[abazgwa21cz]

how can i check that ? 

[PickleRick]

iostat/iotop/vmstat, your hardware monitoring tools

Work with your infrastructure team.