Update Prometheus components

* Update node_exporter to 1.0.1.
* Update Prometheus to 2.20.1.
* Update pgbouncer_exporter to 0.4.0.
* Update redis_exporter to 1.6.1.
* Redis exporter doesn't use inline vendor data anymore.

Signed-off-by: Ben Kochie <bjk@gitlab.com>

changelogs/unreleased/bjk-bump_prom_13-1.yml

+---
+title: Update Prometheus components
+merge_request: 4303
+author:
+type: other

config/software/node-exporter.rb

@@ -18,7 +18,7 @@ require "#{Omnibus::Config.project_root}/lib/gitlab/version"
 require "#{Omnibus::Config.project_root}/lib/gitlab/prometheus_helper"
 name 'node-exporter'
-version = Gitlab::Version.new('node-exporter', '0.18.1')
+version = Gitlab::Version.new('node-exporter', '1.0.1')
 default_version version.print
 license 'APACHE-2.0'

config/software/pgbouncer-exporter.rb

@@ -20,7 +20,7 @@ require "#{Omnibus::Config.project_root}/lib/gitlab/version"
 require "#{Omnibus::Config.project_root}/lib/gitlab/prometheus_helper"
 name 'pgbouncer-exporter'
-version = Gitlab::Version.new('pgbouncer-exporter', '0.2.0')
+version = Gitlab::Version.new('pgbouncer-exporter', '0.4.0')
 default_version version.print
 license 'MIT'

config/software/prometheus.rb

@@ -20,7 +20,7 @@ require "#{Omnibus::Config.project_root}/lib/gitlab/version"
 require "#{Omnibus::Config.project_root}/lib/gitlab/prometheus_helper"
 name 'prometheus'
-version = Gitlab::Version.new('prometheus', '2.16.0')
+version = Gitlab::Version.new('prometheus', '2.20.1')
 default_version version.print
 license 'APACHE-2.0'

config/software/redis-exporter.rb

@@ -20,7 +20,7 @@ require "#{Omnibus::Config.project_root}/lib/gitlab/version"
 require 'time'
 name 'redis-exporter'
-version = Gitlab::Version.new('redis-exporter', '1.3.5')
+version = Gitlab::Version.new('redis-exporter', '1.6.1')
 default_version version.print
 license 'MIT'
@@ -42,7 +42,7 @@ build do
     "-X main.BuildCommitSha=''",
   ].join(' ')
-  command "go build -mod=vendor -ldflags '#{ldflags}'", env: env
+  command "go build -ldflags '#{ldflags}'", env: env
   copy 'redis_exporter', "#{install_dir}/embedded/bin/"
   command "license_finder report --decisions-file=#{Omnibus::Config.project_root}/support/dependency_decisions.yml --format=csv --save=license.csv"