Upgrade Prometheus to pick 8594 (#3989)

Signed-off-by: Marco Pracucci <[email protected]>

Author: pracucci

go.mod

@@ -47,7 +47,7 @@ require (
 	github.com/prometheus/client_golang v1.9.0
 	github.com/prometheus/client_model v0.2.0
 	github.com/prometheus/common v0.18.0
-	github.com/prometheus/prometheus v1.8.2-0.20210319122004-e4f076f81302
+	github.com/prometheus/prometheus v1.8.2-0.20210321183757-31a518faab18
 	github.com/segmentio/fasthash v0.0.0-20180216231524-a72b379d632e
 	github.com/sony/gobreaker v0.4.1
 	github.com/spf13/afero v1.2.2

go.sum

@@ -1100,8 +1100,8 @@ github.com/prometheus/prometheus v1.8.2-0.20201029103703-63be30dceed9/go.mod h1:
 github.com/prometheus/prometheus v1.8.2-0.20201119142752-3ad25a6dc3d9/go.mod h1:1MDE/bXgu4gqd5w/otko6WQpXZX9vu8QX4KbitCmaPg=
 github.com/prometheus/prometheus v1.8.2-0.20201119181812-c8f810083d3f/go.mod h1:1MDE/bXgu4gqd5w/otko6WQpXZX9vu8QX4KbitCmaPg=
 github.com/prometheus/prometheus v1.8.2-0.20210215121130-6f488061dfb4/go.mod h1:NAYujktP0dmSSpeV155mtnwX2pndLpVVK/Ps68R01TA=
-github.com/prometheus/prometheus v1.8.2-0.20210319122004-e4f076f81302 h1:Cn4/28Finy29V4D+Exbo2l3NVsio8GrfyYZl80U2JCI=
-github.com/prometheus/prometheus v1.8.2-0.20210319122004-e4f076f81302/go.mod h1:MS/bpdil77lPbfQeKk6OqVQ9OLnpN3Rszd0hka0EOWE=
+github.com/prometheus/prometheus v1.8.2-0.20210321183757-31a518faab18 h1:8chKJNOWv10FApdXgQ8Td8oYFrfFTbiBp/QpBaxEMRA=
+github.com/prometheus/prometheus v1.8.2-0.20210321183757-31a518faab18/go.mod h1:MS/bpdil77lPbfQeKk6OqVQ9OLnpN3Rszd0hka0EOWE=
 github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
 github.com/rafaeljusto/redigomock v0.0.0-20190202135759-257e089e14a1/go.mod h1:JaY6n2sDr+z2WTsXkOmNRUfDy6FN0L6Nk7x06ndm4tY=
 github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=