add(plugin): HAProxy Web Stats

[thibaults-centreon]

Ref CTOR-680

Description

This plugin allows to monitor Haproxy (including OSS/free versions) using the HAProxy "stats" page. It only supports the 'json' format, the csv format is not compatible.

It provides 2 modes with type 3 counters:

• "backends" with associated "servers"
• "frontends" with associated "listeners"

It also provides a gerneric service discovery mode ("list-objects") that can be used for both frontends & backends discovery

./centreon_plugins.pl --plugin=apps::haproxy::web::plugin  --hostname='demo.haproxy.org' --port='80' --urlpath='/;json' --mode=frontend-usage --add-listeners --verbose 
OK: Frontend 'http-in' frontend status: OPEN, current session rate: 1/s, max session rate: 729/s, current sessions: 71, total sessions: 5182210, max sessions: 100, traffic in: 104.58 b/s, traffic out: 3.79 Kb/s, denied requests: 399251, denied responses: 0, error requests: 114523 - listeners are ok | 'http-in#frontend.session.current.rate.countpersecond'=1;;;0; 'http-in#frontend.session.max.rate.countpersecond'=729;;;0; 'http-in#frontend.sessions.current.count'=71;;;0; 'http-in#frontend.sessions.total.count'=5182210;;;0; 'http-in#frontend.sessions.maximum.count'=100;;;0; 'http-in#frontend.traffic.in.bitpersecond'=104.58b/s;;;0; 'http-in#frontend.traffic.out.bitpersecond'=3789.15b/s;;;0; 'http-in#frontend.requests.denied.count'=399251;;;0; 'http-in#frontend.responses.denied.count'=0;;;0; 'http-in#frontend.requests.error.count'=114523;;;0; 'IPv4-direct#listener.sessions.current.count'=69;;;0; 'IPv4-direct#listener.requests.denied.count'=335998;;;0; 'IPv4-direct#listener.responses.denied.count'=0;;;0; 'IPv4-direct#listener.requests.error.count'=86039;;;0; 'listener.traffic.in.bitpersecond'=65.06b/s;;;0; 'IPv4-direct#listener.traffic.out.bitpersecond'=2896.17b/s;;;0; 'IPv4-cached#listener.sessions.current.count'=0;;;0; 'IPv4-cached#listener.requests.denied.count'=31803;;;0; 'IPv4-cached#listener.responses.denied.count'=0;;;0; 'IPv4-cached#listener.requests.error.count'=9075;;;0; 'listener.traffic.in.bitpersecond'=19.67b/s;;;0; 'IPv4-cached#listener.traffic.out.bitpersecond'=37.26b/s;;;0; 'IPv6-direct#listener.sessions.current.count'=0;;;0; 'IPv6-direct#listener.requests.denied.count'=0;;;0; 'IPv6-direct#listener.responses.denied.count'=0;;;0; 'IPv6-direct#listener.requests.error.count'=0;;;0; 'listener.traffic.in.bitpersecond'=0.00b/s;;;0; 'IPv6-direct#listener.traffic.out.bitpersecond'=0.00b/s;;;0; 'local#listener.sessions.current.count'=0;;;0; 'local#listener.requests.denied.count'=0;;;0; 'local#listener.responses.denied.count'=0;;;0; 'local#listener.requests.error.count'=0;;;0; 'listener.traffic.in.bitpersecond'=0.00b/s;;;0; 'local#listener.traffic.out.bitpersecond'=0.00b/s;;;0; 'local-https#listener.sessions.current.count'=2;;;0; 'local-https#listener.requests.denied.count'=31450;;;0; 'local-https#listener.responses.denied.count'=0;;;0; 'local-https#listener.requests.error.count'=19409;;;0; 'listener.traffic.in.bitpersecond'=19.85b/s;;;0; 'local-https#listener.traffic.out.bitpersecond'=855.73b/s;;;0;
Frontend 'http-in':
    frontend status: OPEN, current session rate: 1/s, max session rate: 729/s, current sessions: 71, total sessions: 5182210, max sessions: 100, traffic in: 104.58 b/s, traffic out: 3.79 Kb/s, denied requests: 399251, denied responses: 0, error requests: 114523
    Listener 'IPv4-direct' status: OPEN, current sessions: 69, denied requests: 335998, denied responses: 0, error requests: 86039, traffic in: 65.06 b/s, traffic out: 2.90 Kb/s
    Listener 'IPv4-cached' status: OPEN, current sessions: 0, denied requests: 31803, denied responses: 0, error requests: 9075, traffic in: 19.67 b/s, traffic out: 37.26 b/s
    Listener 'IPv6-direct' status: OPEN, current sessions: 0, denied requests: 0, denied responses: 0, error requests: 0, traffic in: 0.00 b/s, traffic out: 0.00 b/s
    Listener 'local' status: OPEN, current sessions: 0, denied requests: 0, denied responses: 0, error requests: 0, traffic in: 0.00 b/s, traffic out: 0.00 b/s
    Listener 'local-https' status: OPEN, current sessions: 2, denied requests: 31450, denied responses: 0, error requests: 19409, traffic in: 19.85 b/s, traffic out: 855.73 b/s

Type of change

• Patch fixing an issue (non-breaking change)
• New functionality (non-breaking change)
• Functionality enhancement or optimization (non-breaking change)
• Breaking change (patch or feature) that might cause side effects breaking part of the Software

How this pull request can be tested ?

An online demo is available here: http://demo.haproxy.org/;json

Checklist

• I have followed the coding style guidelines provided by Centreon
• I have commented my code, especially hard-to-understand areas of the PR.
• I have rebased my development branch on the base branch (develop).
• I have provide data or shown output displaying the result of this code in the plugin area concerned.