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module Gitlab
module Metrics
module Subscribers
# Class for tracking the rendering timings of views.
class ActionView < ActiveSupport::Subscriber
include Gitlab::Metrics::Methods
define_histogram :gitlab_view_rendering_duration_seconds do
docstring 'View rendering time'
base_labels Transaction::BASE_LABELS.merge({ path: nil })
buckets [0.001, 0.01, 0.1, 1, 10.0]
with_feature :prometheus_metrics_view_instrumentation
end
attach_to :action_view
SERIES = 'views'.freeze
def render_template(event)
track(event) if current_transaction
end
alias_method :render_view, :render_template
private
def track(event)
values = values_for(event)
tags = tags_for(event)
self.class.gitlab_view_rendering_duration_seconds.observe(current_transaction.labels.merge(tags), event.duration)
current_transaction.increment(:view_duration, event.duration)
current_transaction.add_metric(SERIES, values, tags)
end
def relative_path(path)
path.gsub(%r{^#{Rails.root.to_s}/?}, '')
end
def values_for(event)
{ duration: event.duration }
end
def tags_for(event)
path = relative_path(event.payload[:identifier])
{ view: path }
end
def current_transaction
Transaction.current
end
end
end
end
end
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