Opsview - autodiscoverymanager stuck and not working

Symptoms:

In the UI when you click the Green (Start Scan) Arrow and the status flips from Configured to Pending and back again, It does not look like there is a running scan, 

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Logging in file opsview.log will look something like the below when attempting to run a network scan (also logged in syslog)

Jan 1 08:01:00 orchestrator-ops opsview-autodiscoverymanager[203794]: 
Failed to execute scanning tool: Can't call method "publish" on an undefined value at 
/opt/opsview/tmp/autodiscoverymanager/par-6f707376696577/
cache-6c4749b65d1c56a679f38732aba47c348aebb1c3/
inc/lib/OpsviewAutoDiscoveryManager.pm line 933.

Causes:

OP-39248 & OP-32859

diagnosis of this bug: if a message-queue restart happens at any point, the autodiscoverymanager is then broken until it restarts itself.

Workaround:

1. Stop autodiscovery
   

   /opt/opsview/watchdog/bin/opsview-monit stop opsview-autodiscoverymanager

2. Remove the pid file for autodiscovery

   rm -f /opt/opsview/autodiscoveryscanner/var/autodiscoveryscanner.pid
   

3. Start autodiscovery

   /opt/opsview/watchdog/bin/opsview-monit start opsview-autodiscoverymanager

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I suggest you do the below, if the above does not fix your issue (take a backup of the file just to be safe)

rm -rf /opt/opsview/tmp/autodiscoverymanager/par-6f707376696577/
cache-6c4749b65d1c56a679f38732aba47c348aebb1c3/inc/lib/OpsviewAutoDiscoveryManager.pm

Your logging will look like the below if all is working:

Jan 1 09:02:00 orchestrator-ops opsview-autodiscoveryscanner[2350259]: 
Starting scan 
Jan 1 09:02:00 orchestrator-ops opsview-autodiscoveryscanner[2350259]: 
Scanning 200 hosts

and the UI should say running

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Any issues?

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