1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
module Gitlab
module Metrics
# Class for storing metrics information of a single transaction.
class Transaction
include Gitlab::Metrics::Methods
# base labels shared among all transactions
BASE_LABELS = { controller: nil, action: nil }.freeze
THREAD_KEY = :_gitlab_metrics_transaction
# 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 duration_milliseconds
duration.in_milliseconds.to_i
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.gitlab_transaction_duration_seconds.observe(labels, duration)
self.class.gitlab_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.transaction_metric(event_name, :counter, prefix: 'event_', use_feature_flag: true, tags: 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.transaction_metric(name, :counter).increment(labels, value) if use_prometheus
@values[name] += value
end
def set(name, value, use_prometheus = true)
self.class.transaction_metric(name, :gauge).set(labels, value) if use_prometheus
@values[name] = value
end
def finish
track_self
submit
end
def track_self
values = { duration: duration_milliseconds, 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
define_histogram :gitlab_transaction_duration_seconds do
docstring 'Transaction duration'
base_labels BASE_LABELS
buckets [0.1, 0.25, 0.5, 1.0, 2.5, 5.0]
end
define_histogram :gitlab_transaction_allocated_memory_bytes do
docstring 'Transaction allocated memory bytes'
base_labels BASE_LABELS
buckets [100, 1000, 10000, 100000, 1000000, 10000000]
with_feature :prometheus_metrics_transaction_allocated_memory
end
def self.transaction_metric(name, type, prefix: nil, use_feature_flag: false, tags: {})
metric_name = "gitlab_transaction_#{prefix}#{name}_total".to_sym
fetch_metric(type, metric_name) do
docstring "Transaction #{prefix}#{name} #{type}"
base_labels tags.merge(BASE_LABELS)
with_feature "prometheus_transaction_#{prefix}#{name}_total".to_sym if use_feature_flag
if type == :gauge
multiprocess_mode :livesum
end
end
end
end
end
end
|