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Simple Rails Monitoring
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# services/monitoring/cleanup_service.rb | |
class Monitoring::CleanupService | |
def self.run | |
Monitoring::Measurement.where("recorded_at < ?", 3.months.ago).delete_all | |
end | |
end | |
# let this service run nightly |
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# models/monitoring/job.rb | |
class Monitoring::Job < Monitoring::Measurement | |
# value shows how long the job took in seconds | |
end | |
# config/initializers/monitoring.rb | |
class MonitoringPlugin < Delayed::Plugin | |
callbacks do |lifecycle| | |
lifecycle.around(:perform) do |worker, job, &block| | |
return if job.nil? || block.nil? | |
duration = Benchmark.realtime do | |
block.call(worker) | |
end | |
Monitoring::Job.create!( | |
recorded_at: Time.current, | |
subject: job.name, | |
value: duration, | |
details: {}) | |
rescue => e | |
# notify exception | |
end | |
end | |
end | |
Delayed::Worker.plugins << MonitoringPlugin | |
# example data | |
# | id | type | recorded_at | subject | value | details | | |
# |----|-----------------|---------------------|---------------|-------|---------| | |
# | 1 | Monitoring::Job | 2021-03-15 11:44:00 | SomeJob#run | 0.017 | {} | | |
# | 2 | Monitoring::Job | 2021-03-15 11:44:00 | OtherJob.send | 1.074 | {} | |
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# models/monitoring/mail.rb | |
class Monitoring::Mail < Monitoring::Measurement | |
store_accessor :details, :to | |
# value shows how long the sending took in seconds | |
end | |
# config/initializers/monitoring.rb | |
ActiveSupport::Notifications.subscribe 'deliver.action_mailer' do |name, started, finished, unique_id, data| | |
Monitoring::Mail.create!(recorded_at: started, subject: "#{data[:mailer]}", value: finished - started, to: data[:to]) | |
rescue => e | |
# notify exception | |
end | |
# example data: | |
# | id | type | recorded_at | subject | value | details | | |
# |----|------------------|---------------------|---------|-------|-------------------------------------| | |
# | 1 | Monitoring::Mail | 2021-03-13 11:38:00 | | 0.06 | {"to": ["development@example.net"]} | | |
# | 2 | Monitoring::Mail | 2021-03-13 11:38:00 | | 0.05 | {"to": ["development@example.net"]} | | |
# | 3 | Monitoring::Mail | 2021-03-13 11:38:00 | | 0.05 | {"to": ["development@example.net"]} | |
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# value shows how big the table is in MB | |
class Monitoring::TableSize < Monitoring::Measurement | |
store_accessor :details, :index_size, :data_size | |
end | |
# services/monitoring/table_size_recorder_service.rb | |
class Monitoring::TableSizeRecorderService | |
def self.run | |
query = 'SELECT relname AS table_name, pg_total_relation_size(relid) AS total_size, pg_indexes_size(relid) AS index_size, pg_relation_size(relid) AS data_size FROM pg_catalog.pg_statio_user_tables' | |
ActiveRecord::Base.connection.execute(query).each do |row| | |
Monitoring::TableSize.create!( | |
recorded_at: Time.current, | |
subject: row['table_name'], | |
value: row['total_size'] / 1_048_576.0, # mb | |
index_size: row['index_size'] / 1_048_576.0, | |
data_size: row['data_size'] / 1_048_576.0 | |
) | |
end | |
end | |
end | |
# let this service run nightly | |
# example data: | |
# | id | type | recorded_at | subject | value | details | | |
# |----|-----------------------|---------------------|----------|--------|--------------------------------------------| | |
# | 1 | Monitoring::TableSize | 2021-03-15 11:47:00 | users | 0.59 | {"data_size": 0.414, "index_size": 0.15} | | |
# | 2 | Monitoring::TableSize | 2021-03-15 11:47:00 | articles | 14.48 | {"data_size": 9.703, "index_size": 4.75} | | |
# | 3 | Monitoring::TableSize | 2021-03-15 11:47:00 | sausages | 190.85 | {"data_size": 150.296, "index_size": 40.5} | |
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http://tomrothe.de/posts/dead-simple-rails-monitoring.html