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Limit input size for Prometheus alert JSON payload

What does this MR do?


Limit input size to prevent possible timeouts while processing an alert payload.

The generic alert payload parser has a similar check here and there.


Does this MR meet the acceptance criteria?


Availability and Testing


If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • ~~Label as security and @ mention @gitlab-com/gl-security/appsec~~
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team
Edited by Vitali Tatarintev

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