varnish Monitoring Varnish Client metrics - incoming traffic
Example
Client metrics cover the traffic between the client and the Varnish cache.
- sess_conn - Cumulative number of connections.
- client_req - Cumulative number of client requests.
- sess_dropped - Dropped connections because of a full queue.
Monitor sess_conn and client_req to keep track of traffic volume - is it increasing or decreasing, is it spiking etc. Sudden changes might indicate problems.
Monitor sess_dropped to see if the cache is dropping any sessions. If so you might need to increase thread_pool_max.
varnishstat -1 | grep "sess_conn\|client_req \|sess_dropped"
MAIN.sess_conn 62449574 3.38 Sessions accepted
MAIN.client_req 184697229 9.99 Good client requests received
MAIN.sess_dropped 0 0.00 Sessions dropped for thread
