Problem Definition

Any page that needs to calculate which agents can build something and includes offline agents, for example:

• Tasks
• Requirements
• Agent assignment (Deployments)

Can become non-performant as the amount of offline agents grows. This is a common pattern in instances where customers are spinning up and spinning down agents on demand without deleting them from Bamboo.

Suggested Solution

When filtering offline agents, it might be sensible to filter out agents that have been offline for a certain time period. E.g. 6+ months.

Workaround

Clean up offline agents that are no longer used at Bamboo Administration >> Agents > Offline Agents

Bamboo 6.10.x and later has a REST API that can be used to automate the deletion:
https://docs.atlassian.com/atlassian-bamboo/REST/6.10.4/#d2e857.