Upating icinga2

Hi, we have a few issues with icinga and ive been asked/told to upgrade our version. We have icinga2 v2.9.1 and icingaweb2 v2.6.1
and it appears

Would like to upgrade to latest version. need a guide.

running on rhel 7 (3.10)
Disabled features: command compatlog debuglog elasticsearch gelf influxdb livestatus opentsdb perfdata statusdata syslog
Enabled features: api checker graphite ido-mysql mainlog notification

Is there an easy page to read about upgrading ? the icinga web page doesnt make too much sense (to me that is).

What about the sections for icinga and icingaweb?