Add User Profile Size Limit Enforced During Profile Updates #137712
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…ential heap memory exhaustion.
ebarlas
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>bug
:Security/Security
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Currently, there are no limits on the size of a user profile. Profiles store username, initials, avatars, etc.
Authorized Kibana observability clients can store an unlimited amount of data in user profile via update-profile.
This change puts a limit on profile size to avoid heap memory pressure and OOM crashes.
A limit of 10 MB was chosen to remain safely above the 1 MB request limit size enforced by Kibana.
Limit enforcement is implemented with a profile document read before the update, to provide a full view of the profile footprint. This approach is intended to be lightweight. Still, a document read is now incurred for every update request.