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Relates to https://github.com/coder/coder/issues/17432 ### Part 1: Notes: - `GetPresetsAtFailureLimit` SQL query is added, which is similar to `GetPresetsBackoff`, they use same CTEs: `filtered_builds`, `time_sorted_builds`, but they are still different. - Query is executed on every loop iteration. We can consider marking specific preset as permanently failed as an optimization to avoid executing query on every loop iteration. But I decided don't do it for now. - By default `FailureHardLimit` is set to 3. - `FailureHardLimit` is configurable. Setting it to zero - means that hard limit is disabled. ### Part 2 Notes: - `PrebuildFailureLimitReached` notification is added. - Notification is sent to template admins. - Notification is sent only the first time, when hard limit is reached. But it will `log.Warn` on every loop iteration. - I introduced this enum: ```sql CREATE TYPE prebuild_status AS ENUM ( 'normal', -- Prebuilds are working as expected; this is the default, healthy state. 'hard_limited', -- Prebuilds have failed repeatedly and hit the configured hard failure limit; won't be retried anymore. 'validation_failed' -- Prebuilds failed due to a non-retryable validation error (e.g. template misconfiguration); won't be retried. ); ``` `validation_failed` not used in this PR, but I think it will be used in next one, so I wanted to save us an extra migration. - Notification looks like this: <img width="472" alt="image" src="https://github.com/user-attachments/assets/e10efea0-1790-4e7f-a65c-f94c40fced27" /> ### Latest notification views: <img width="463" alt="image" src="https://github.com/user-attachments/assets/11310c58-68d1-4075-a497-f76d854633fe" /> <img width="725" alt="image" src="https://github.com/user-attachments/assets/6bbfe21a-91ac-47c3-a9d1-21807bb0c53a" />