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[Aliaksandr Vasiuk <1989032@xxxxxxxxxxxxxxxxxx>]

Hey Linda, thanks for reporting the issue! Would you elaborate on the expected behavior? 
That how I tried to set proxy for pagerduty and seems like it works for me
1. I deployed charm-nagios revision 49
2. Did `juju config central-monitor enable_pagerduty=true`
3. Checked that no --proxy switch in `/etc/cron.d/nagios-pagerduty-flush`
 $ cat /etc/cron.d/nagios-pagerduty-flush
 #------------------------------------------------
 # This file is juju managed
 #------------------------------------------------
 
 # Flush the nagios pagerduty alerts every minute as per
 # http://www.pagerduty.com/docs/guides/nagios-perl-integration-guide/
 * * * * *   nagios  /usr/local/bin/pagerduty_nagios.pl flush  --queue-dir /var/lib/nagios3  /pagerduty
4. Then set proxy for juju `juju model-config juju-https-proxy=http://squid.internal:3128`
5. Disabled and enabled pagerduty to reconfigure it:
 $ juju config central-monitor enable_pagerduty=false
 $ juju config central-monitor enable_pagerduty=true
6. Once charm is ready check pagerduty cronjob again
 $ cat /etc/cron.d/nagios-pagerduty-flush
 #------------------------------------------------
 # This file is juju managed
 #------------------------------------------------
 
 # Flush the nagios pagerduty alerts every minute as per
 # http://www.pagerduty.com/docs/guides/nagios-perl-integration-guide/
 * * * * *   nagios  /usr/local/bin/pagerduty_nagios.pl flush --proxy http://squid.internal:3128 --queue-dir /var/lib/nagios3/pagerduty

As you see the --proxy switch is added to the cronjob configuration.
Maybe I'm reproducing it in the wrong way. Should I set JUJU_CHARM_HTTPS_PROXY somehow another way? Or should the charm be reconfigured right after `juju model-config juju-https-proxy=http://squid.internal:3128` without manipulations with the charm configuration (maybe in such a case makes sense to add proxy to charm's configurable params list...)
I am looking forward to your reply!

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https://bugs.launchpad.net/bugs/1989032

Title:
  pagerduty cron job doesn't update proxy when proxy IP is changed

Status in Nagios Charm:
  In Progress

Bug description:
  Nagios gets proxy IP from environment variable. When proxy is changed,
  pagetduty cron job (/etc/cron.d/nagios-pagerduty-flush) is not updated

  
          proxy = env.get("JUJU_CHARM_HTTPS_PROXY") or env.get("https_proxy")
          proxy_switch = "--proxy {}".format(proxy) if proxy else ""

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