Issue Summary

This is reproducible on Data Center: yes

Steps to Reproduce

1. Enable the app upload functionality in the UPM. 
2. Upload the "Zendesk Support for Jira" version 3.0.29 .jar file.
3. Intermittently, the upload will cause Jira to hang during app installation. 

App package: Zendesk Support for Jira 3.0.29 https://marketplace.atlassian.com/download/apps/1211941/version/10000520

Symptoms: When uploading this app package, sometimes it will cause Jira to hang and the package installation will not finish. It also logs weird entries in the logs with an app ID and no timestamp, vendor name, app name, etc.

Expected Results

No impact on performance, app is installed and enabled.

Actual Results

The App ID and status is shown in the logs but with no timestamps:

c996a9ea-a83c--4cee-a986-a4a4396821ef  current installed next disabled false
c996a9ea-a83c--4cee-a986-a4a4396821ef  status installed to disabled
c996a9ea-a83c--4cee-a986-a4a4396821ef  current disabled next disabled false
c996a9ea-a83c--4cee-a986-a4a4396821ef  current disabled next uninstalled false
c996a9ea-a83c--4cee-a986-a4a4396821ef  status disabled to uninstalled
c996a9ea-a83c--4cee-a986-a4a4396821ef  current null next enabled true
c996a9ea-a83c--4cee-a986-a4a4396821ef  status null to installed 

Workaround

Customers can directly add the .jar file into the installed-plugins directory and restart the node to load the app.