Follow-up from "Add RCA Claude 4 upgrade"

Everyone can contribute. Help move this issue forward while earning points, leveling up and collecting rewards.

• Close this issue

The following discussion from !195598 (merged) should be addressed:

• @mfanGitLab started a discussion:

  This prompt has been moved from rails into ai-gateway. We no longer need this prompt and anything associated with this here.

  We can use a static estimated constant for prompt_size_without_log