Lists all silences for this system's organization, filtered to silences that target this system's system_key.
The proxy injects a system_key filter to ensure each system only sees its own silences.
Access control: Requires HTTP Basic Auth with valid system credentials.
GET
/services/mimir/alertmanager/api/v2/silences
curl \
--request GET 'https://api.your-domain.com/api/services/mimir/alertmanager/api/v2/silences' \
--user "username:password"