I performed upgrade from Atlassian Bitbucket v4.12.0 to v5.6.1.
I noticed that menu "Support tools" changed to
"Troubleshooting and support tools".
When I tried to run Log analyzer, I got:
Error creating support zip
We couldn't run the log analyzer. The log analyzer needs to download content from http://confluence.atlassian.com to work. Check you have a working internet connection to this site, and click Scan to try again.
I run "Create support zip" separate and it succeeded.
There are any errors in atlassian-bitbucket.log
Atlassian Troubleshooting and Support Tools plugin version - 1.6.1