6075b1cd4e
This originated from https://github.com/mattermost/mattermost/issues/15249. However, the original idea was discarded https://github.com/mattermost/mattermost/issues/15249#issuecomment-709713065 as being too complicated to implement. Then I had another idea to implement it just for session objects. My thinking was that since every single request allocates a new session struct, it would be good to use a sync.Pool for that. However, 4 years later, now we know that the primary bottleneck in app performance comes from websocket event marshalling. Therefore, while it would be good to do this, it is difficult to do it correctly (as shown by the numerous racy tests). Hence, reverting this. ```release-note NONE ```
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