@Aashirwadjain please add documentation changes (I've pointed where the documentation is to be added below), without which customers would not be aware of the addition of this new attribute.

@Aashirwadjain in addition, please add relevant changes to integration tests, to make sure this new attribute is also part of the configuration that is created, read, and updated by the integration test for muting rules.

Please see the following file, add wherever appropriate. By this, I mean - you don't have to add the attribute to all tests, just make sure the attribute is added wherever needed to make sure atleast one test fully covers this attribute too, along with other attributes of the resource (during create, read, update).

@Aashirwadjain one occurrence that you will also find while testing your changes :)

• compile your local changes and try using a configuration of the resource newrelic_alert_muting_rule, but without the new attribute you've added. Perform a terraform plan and terraform apply to create a brand new muting rule.
• immediately after the above, run a terraform plan. Since no external changes were made in the UI, or in the Terraform configuration, the expectation of this terraform plan would be a "no changes" output, but you see a that a drift is being shown, of a change that the customer did not make, with regard to this new attribute.

Think of why this is happening, and what needs to be added/deleted/fixed in the code to prevent this occurrence. Fixing this is important, otherwise this would affect current customers using this Terraform resource without the new attribute (if these changes are merged without the fix, they would see a change upon terraform plan they did not make, or have no idea about).

Please rigorously test your changes to help fill such gaps :)

Thanks for suggestions @pranav-new-relic, Following changes are made accordingly:

• Documentation is updated and added description of action_on_muting_rule_window_ended attribute.
• action_on_muting_rule_window_ended attribute is added to integration tests.
• flattenMutingRule method is updated and added validations.

we should be good to merge once the requested changes are done (and further reviewed by VIshal/me), but ⚠️

• after the freeze
• after Rohan's PR refactor(gcp-link-account): Refactor GCP integration resource for readability #2785 is merged
• after the Go Client with these changes feat(alert_muting_rule): Add action_on_muting_rule_window_ended attribute in newrelic_alert_muting_rule Terraform Resource newrelic-client-go#1259 is released, and go.mod in this PR is updated with the corresponding release version of the Go Client containing those changes