Update changelog
Update changelog

Signed-off-by: Fabian Reinartz <bb86cc68560718128c801bf7438361ace07bbc0d@google.com>

prometheus/prometheus,amorken/prometheus,amorken/prometheus,kangwoo/prometheus,kangwoo/prometheus,prometheus/prometheus,kangwoo/prometheus,keegancsmith/prometheus,GoogleCloudPlatform/prometheus,Gouthamve/prometheus,keegancsmith/prometheus,alileza/prometheus,prometheus/prometheus,amorken/prometheus,amorken/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,Gouthamve/prometheus,prometheus/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,Gouthamve/prometheus,alileza/prometheus,prometheus/prometheus,kangwoo/prometheus,alileza/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,alileza/prometheus,Gouthamve/prometheus