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puma: add Prometheus metrics exporter.

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To test it, run `bin/rails server` then do `curl http://localhost:9393`.

https://github.com/harmjanblok/puma-metrics
This commit is contained in:
evazion
2021-09-11 10:09:58 -05:00
parent ee1c3c9418
commit 0aab81440f
3 changed files with 14 additions and 0 deletions
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1
Gemfile
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@@ -53,6 +53,7 @@ gem 'bcrypt_pbkdf' # https://github.com/net-ssh/net-ssh/issues/565
gem 'terminal-table' gem 'terminal-table'
gem 'newrelic_rpm', require: false gem 'newrelic_rpm', require: false
gem 'clockwork' gem 'clockwork'
gem 'puma-metrics'
group :production, :staging do group :production, :staging do
gem 'unicorn', :platforms => :ruby gem 'unicorn', :platforms => :ruby

5
Gemfile.lock
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@@ -316,6 +316,7 @@ GEM
parser (3.0.2.0) parser (3.0.2.0)
ast (~> 2.4.1) ast (~> 2.4.1)
pg (1.2.3) pg (1.2.3)
prometheus-client (2.1.0)
pry (0.13.1) pry (0.13.1)
coderay (~> 1.1) coderay (~> 1.1)
method_source (~> 1.0) method_source (~> 1.0)
@@ -327,6 +328,9 @@ GEM
public_suffix (4.0.6) public_suffix (4.0.6)
puma (5.4.0) puma (5.4.0)
nio4r (~> 2.0) nio4r (~> 2.0)
puma-metrics (1.2.3)
prometheus-client (>= 0.10)
puma (>= 3.0)
pundit (2.1.1) pundit (2.1.1)
activesupport (>= 3.0.0) activesupport (>= 3.0.0)
racc (1.5.2) racc (1.5.2)
@@ -557,6 +561,7 @@ DEPENDENCIES
pry-byebug pry-byebug
pry-rails pry-rails
puma puma
puma-metrics
pundit pundit
rack-mini-profiler rack-mini-profiler
rails (~> 6.0) rails (~> 6.0)

8
config/puma.rb
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@@ -12,6 +12,7 @@
# * PUMA_WORKER_TIMEOUT # * PUMA_WORKER_TIMEOUT
# * PUMA_PIDFILE # * PUMA_PIDFILE
# * PUMA_CONTROL_URL # * PUMA_CONTROL_URL
# * PUMA_METRICS_URL
# #
# Use `bin/pumactl` to control a running Puma instance. # Use `bin/pumactl` to control a running Puma instance.
# #
@@ -84,6 +85,13 @@ end
# Allow puma to be restarted by `rails restart` command. # Allow puma to be restarted by `rails restart` command.
plugin :tmp_restart plugin :tmp_restart
# Enable Prometheus metrics.
# https://github.com/harmjanblok/puma-metrics
plugin :metrics
# Export Prometheus metrics by default on http://localhost:9393
metrics_url ENV.fetch("PUMA_METRICS_URL", "tcp://localhost:9393")
# Start the Puma control rack application on +url+. This application can # Start the Puma control rack application on +url+. This application can
# be communicated with to control the main server. Additionally, you can # be communicated with to control the main server. Additionally, you can
# provide an authentication token, so all requests to the control server # provide an authentication token, so all requests to the control server