Add analytics for open files / processes / threads

[Pascal Chambon]

I've sometimes had nasty cases where "max open files" limits were reached, or the count of processes (fork-bomb) or threads were too high for the system.

Wouldn't it be a good idea to monitor also these (often underestimated) resources in monit and m/monit ?

[Tildeslash]

Hello,

thanks for feedback, yes, filedescriptors monitoring will be nice feature and we may add it in the future.

Putting on hold for now (working on other features currently, will keep this feature in mind).

[Tildeslash]

Add ability to monitor the number of open files of a process

Currently only implemented for Linux

Natural syntax:

check process myproc with pidfile /var/run/myproc.pid
    if open-files >= 100 then alert
    if total open-files > 5000 then alert

Based on work of Marcel Baur https://bitbucket.org/tildeslash/monit/pull-requests/56

Closes: #156

→ <<cset cb30233aadf1>>

[Tildeslash]

the open-file per process doesn't fully cover this feature request

TODO:

• system-wide process count limits
• system-wide files limit

‌

[Tildeslash]

system-wide and per-process filedescriptor usage test implemented in monit 5.27.0