Healthchecks

Improvements

• Update Opsgenie instructions
• Update Spike.sh instructions
• Add system check to validate settings.SITE_ROOT (#895)
• Add tooltips to tag buttons in the checks list screen (#911)
• Improve Email - Keywoard Filtering docs (by @mmomjian)
• Split the grace time input field into value/unit input group (#945, by @mickBoat00)
• Add a system check to warn about MariaDB UUID migration (#929)

Bug Fixes

• Increase uWSGI buffer size to allow requests with large cookies (#925)
• Fix crash when processing one-shot OnCalendar schedules
• Fix the handling of ping bodies > 2.5MB (#931)
• Fix crash when inviting team member but SMTP is not configured (by @marlenekoh)