How to monitor slow request?

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I am building a ceph moninter dashboard and I want to moniter how many slow requests are on each node. But I find the ceph.log some time only log like below:
2017-12-27 14:59:47.852396 mon.mnc000 mon.0 192.168.99.80:6789/0 2147 : cluster [WRN] Health check failed: 4 slow requests are blocked > 32 sec (REQUEST_SLOW)
 
There is no osd id info about where the slow reqeust happenened.
 
what would be a proper way to moniter which osd caused the slow request and how many slow requests are one that osd?
 
 
2017-12-27

shadow_lin
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