Ctx name (#5961)
Ctx name (#5961)

* scrape: rename ctx name for readability

Signed-off-by: johncming <64aa7c399bffb85fffaccf95be9acb9553c38de5@yahoo.com>

* scrape: use self ctx instead of parent ctx.

Signed-off-by: johncming <64aa7c399bffb85fffaccf95be9acb9553c38de5@yahoo.com>

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