Add logrotate entry for apache process of monitoring stack.

@Nicolas , @rafael , @klaus  please review.

/reviewed-on nexedi/slapos!276

stack/monitor/buildout.hash.cfg

@@ -15,4 +15,4 @@
 # not need these here).
 [monitor2-template]
 filename = instance-monitor.cfg.jinja2.in
-md5sum = 5027f0b1abcc28ce3817cd70fb667a3b
+md5sum = dd2e6146d9d33a21bf9df6d397db855f

stack/monitor/instance-monitor.cfg.jinja2.in

@@ -234,6 +234,12 @@ context =
     raw dash_binary {{ dash_executable_location }}
 command = kill -USR1 $(cat ${monitor-httpd-conf-parameter:pid-file})
 
+[logrotate-entry-monitor-httpd]
+<= logrotate-entry-base
+name = monitor-apache
+log = $${basedirectory:log}/monitor/monitor-httpd-error.log
+post = test ! -s $${buildout:directory}/var/run/monitor-httpd.pid || $${buildout:directory}/bin/slapos-kill --pidfile $${buildout:directory}/var/run/monitor-httpd.pid -s USR1
+
 [xnice-bin]
 recipe = collective.recipe.template
 input = inline:#!/bin/sh
@@ -407,6 +413,7 @@ depends =
   ${monitor-bootstrap-promise:file}
   ${promise-check-slapgrid:output}
   ${promise-monitor-httpd-is-process-older-than-dependency-set:wrapper-path}
+  ${logrotate-entry-monitor-httpd:name}
 
 [monitor-publish]
 monitor-base-url = ${monitor-publish-parameters:monitor-base-url}