Docs: target_match and source_match are DEPRECATED (#2665)
Docs: target_match and source_match are DEPRECATED (#2665)

* target_match and source_match are DEPRECATED

Signed-off-by: Dmitry Tolstoy <10125278f6c98f5e6d5cc1c73804ac3fb0b11dc1@ya.ru>
prometheus/alertmanager,GoogleCloudPlatform/alertmanager,GoogleCloudPlatform/alertmanager,prometheus/alertmanager,GoogleCloudPlatform/alertmanager,prometheus/alertmanager,prometheus/alertmanager,GoogleCloudPlatform/alertmanager