When creating alerting silence from RHOCP UI without specifying "Creator" field, error "createdBy in body is required" even though field "Creator" is not marked as mandatory.

4.15.5

100%

    1. Login to webconsole (Admin view)
    2. Observe > Alerting
    3. Select the alert to silence
    4. Click Create Silence.
    5. in Info section, update the "Comment" field and skip the "Creator" field. Now, click on Create button.
    6. It will throw an error "createdBy in body is required". 
    

Able to create alerting silence without specifying "Creator" field.

User should not be able to create silences without specifying "Creator" field as it should be a mandatory.

The steps works well for prior version of RHOCP 4.15 (tested on 4.14)