When the TaskRunResult is created due to a successful task reap by a bot, the bot dimensions are stored in the entity. The bot state should be saved to, as this is useful to debug bot state specific issues.

Keep in mind this is completely unstructured data but it's still valuable for developers looking for specific states (e.g. Android)

https://chromium.googlesource.com/infra/luci/luci-py.git/+/fdb781fb11b12b4472c1cd158963f215fda59f68/appengine/swarming/server/task_result.py#414

One question is if it should be stored in the TaskResultSummary. Probably not.