Monitoring
6 answers
Charts, dashboards and where the numbers come from.
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305 See how busy the load balancers are
Utilization. Requests, connections, processor and memory over time, with windows from the last fifteen minutes to the last thirty days. A number on its own tells you about this second, and a line tells you whether it is normal.
306 Get charts for my backend servers
Put the address pattern in the pool settings, using {host} where the server address goes, so one pattern covers every member. The load balancer reads numbers your servers already publish. Many do without anybody setting it up.
It has no login on your application servers and does not want one. Holding a password for every machine in the estate would make this the most valuable box on your network.
307 Why is there a gap in a chart?
No measurement was taken then, usually because something was restarting. It is drawn as a gap and not as zero, because zero would read as the server being idle when it was actually being restarted.
308 Understand the dropped column on the dashboard
Connections nginx accepted and could not handle. It is nearly always zero. When it is not, something is wrong and it is worth finding out what.
309 Why do the rates take half a minute to appear?
They are worked out between two samples fifteen seconds apart, so after a restart there is nothing to compare against for half a minute.
310 Get per site traffic numbers
Not available today. stub_status is a whole server figure, and per site numbers would need log parsing, which is on the roadmap rather than in the product. The generated log format already carries everything it would need.