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|
module Gitlab
module Metrics
# Class for storing metrics information of a single transaction.
class Transaction
# base labels shared among all transactions
BASE_LABELS = { controller: nil, action: nil }.freeze
THREAD_KEY = :_gitlab_metrics_transaction
METRICS_MUTEX = Mutex.new
# The series to store events (e.g. Git pushes) in.
EVENT_SERIES = 'events'.freeze
attr_reader :tags, :values, :method, :metrics
def self.current
Thread.current[THREAD_KEY]
end
def initialize
@metrics = []
@methods = {}
@started_at = nil
@finished_at = nil
@values = Hash.new(0)
@tags = {}
@memory_before = 0
@memory_after = 0
end
def duration
@finished_at ? (@finished_at - @started_at) : 0.0
end
def allocated_memory
@memory_after - @memory_before
end
def run
Thread.current[THREAD_KEY] = self
@memory_before = System.memory_usage
@started_at = System.monotonic_time
yield
ensure
@memory_after = System.memory_usage
@finished_at = System.monotonic_time
self.class.metric_transaction_duration_seconds.observe(labels, duration * 1000)
self.class.metric_transaction_allocated_memory_bytes.observe(labels, allocated_memory * 1024.0)
Thread.current[THREAD_KEY] = nil
end
def add_metric(series, values, tags = {})
@metrics << Metric.new("#{Metrics.series_prefix}#{series}", values, tags)
end
# Tracks a business level event
#
# Business level events including events such as Git pushes, Emails being
# sent, etc.
#
# event_name - The name of the event (e.g. "git_push").
# tags - A set of tags to attach to the event.
def add_event(event_name, tags = {})
self.class.metric_event_counter(event_name, tags).increment(tags.merge(labels))
@metrics << Metric.new(EVENT_SERIES, { count: 1 }, tags.merge(event: event_name), :event)
end
# Returns a MethodCall object for the given name.
def method_call_for(name, module_name, method_name)
unless method = @methods[name]
@methods[name] = method = MethodCall.new(name, module_name, method_name, self)
end
method
end
def increment(name, value, use_prometheus = true)
self.class.metric_transaction_counter(name).increment(labels, value) if use_prometheus
@values[name] += value
end
def set(name, value, use_prometheus = true)
self.class.metric_transaction_gauge(name).set(labels, value) if use_prometheus
@values[name] = value
end
def finish
track_self
submit
end
def track_self
values = { duration: duration, allocated_memory: allocated_memory }
@values.each do |name, value|
values[name] = value
end
add_metric('transactions', values, @tags)
end
def submit
submit = @metrics.dup
@methods.each do |name, method|
submit << method.to_metric if method.above_threshold?
end
submit_hashes = submit.map do |metric|
hash = metric.to_hash
hash[:tags][:action] ||= action if action && !metric.event?
hash
end
Metrics.submit_metrics(submit_hashes)
end
def labels
BASE_LABELS
end
# returns string describing the action performed, usually the class plus method name.
def action
"#{labels[:controller]}##{labels[:action]}" if labels && !labels.empty?
end
def self.metric_transaction_duration_seconds
return @metric_transaction_duration_seconds if @metric_transaction_duration_seconds
METRICS_MUTEX.synchronize do
@metric_transaction_duration_seconds ||= Gitlab::Metrics.histogram(
:gitlab_transaction_duration_seconds,
'Transaction duration',
BASE_LABELS,
[0.001, 0.002, 0.005, 0.01, 0.02, 0.05, 0.1, 0.500, 2.0, 10.0]
)
end
end
def self.metric_transaction_allocated_memory_bytes
return @metric_transaction_allocated_memory_bytes if @metric_transaction_allocated_memory_bytes
METRICS_MUTEX.synchronize do
@metric_transaction_allocated_memory_bytes ||= Gitlab::Metrics.histogram(
:gitlab_transaction_allocated_memory_bytes,
'Transaction allocated memory bytes',
BASE_LABELS,
[1000, 10000, 20000, 500000, 1000000, 2000000, 5000000, 10000000, 20000000, 100000000]
)
end
end
def self.metric_event_counter(event_name, tags)
return @metric_event_counters[event_name] if @metric_event_counters&.has_key?(event_name)
METRICS_MUTEX.synchronize do
@metric_event_counters ||= {}
@metric_event_counters[event_name] ||= Gitlab::Metrics.counter(
"gitlab_transaction_event_#{event_name}_total".to_sym,
"Transaction event #{event_name} counter",
tags.merge(BASE_LABELS)
)
end
end
def self.metric_transaction_counter(name)
return @metric_transaction_counters[name] if @metric_transaction_counters&.has_key?(name)
METRICS_MUTEX.synchronize do
@metric_transaction_counters ||= {}
@metric_transaction_counters[name] ||= Gitlab::Metrics.counter(
"gitlab_transaction_#{name}_total".to_sym, "Transaction #{name} counter", BASE_LABELS
)
end
end
def self.metric_transaction_gauge(name)
return @metric_transaction_gauges[name] if @metric_transaction_gauges&.has_key?(name)
METRICS_MUTEX.synchronize do
@metric_transaction_gauges ||= {}
@metric_transaction_gauges[name] ||= Gitlab::Metrics.gauge(
"gitlab_transaction_#{name}".to_sym, "Transaction gauge #{name}", BASE_LABELS, :livesum
)
end
end
end
end
end
|
