This is a clone of issue OCPBUGS-56095. The following is the description of the original issue:
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Description of problem:

4.19.0-0.nightly-2025-05-12-071854 cluster, admin user goes to "Observe -> Alerting -> Silences" tab, click "Create silence" button, "Negative matcher" checkbox is checked by default on Create silence page, which should not, see picture: https://drive.google.com/file/d/1CgmCxyWwGvJw2RkXUzR6_iJTJWMUyiam/view?usp=sharing

checked in 4.18, it's not checked by default, see: https://drive.google.com/file/d/1JGaGsHY9vnGCi3kdU8O_J_dYyyYEOgiS/view?usp=sharing

Version-Release number of selected component (if applicable):

4.19.0-0.nightly-2025-05-12-071854 

How reproducible:

always

Steps to Reproduce:

1. see the description

Actual results:

"Negative matcher" is checked by default on Create silence page

Expected results:

should not

Additional info: