Move Prometheus presentation logic to PrometheusText

+ Use NullMetrics to mock metrics when unused
+ Use method_missing in NullMetrics mocking
+ Update prometheus gem to version that correctly uses transitive dependencies
+ Ensure correct folders are used in Multiprocess prometheus client tests.
+ rename Sessions controller's metric

1 files changed, 1 insertions, 2 deletions

diff --git a/Gemfile b/Gemfile
index 8ec2c94a2e0..0c18007d447 100644
--- a/Gemfile
+++ b/Gemfile
@@ -270,8 +270,7 @@ group :metrics do
   gem 'influxdb', '~> 0.2', require: false
 
   # Prometheus
-  gem 'mmap2', '~> 2.2.6'
-  gem 'prometheus-client-mmap', '~>0.7.0.beta3'
+  gem 'prometheus-client-mmap', '~>0.7.0.beta5'
 end
 
 group :development do