# Instrumenting Ruby code
> 原文:[https://docs.gitlab.com/ee/development/instrumentation.html](https://docs.gitlab.com/ee/development/instrumentation.html)
* [Instrumenting Methods](#instrumenting-methods)
* [Examples](#examples)
* [Checking Instrumented Methods](#checking-instrumented-methods)
* [Instrumenting Ruby Blocks](#instrumenting-ruby-blocks)
* [Tracking Custom Events](#tracking-custom-events)
# Instrumenting Ruby code[](#instrumenting-ruby-code "Permalink")
[GitLab Performance Monitoring](../administration/monitoring/performance/index.html)可以检测 Ruby 代码的方法和自定义块. 方法检测是基于块的检测的主要检测形式,仅当我们想深入到方法中特定代码区域时才使用.
如果要跟踪产品使用模式,请参考[遥测](telemetry/index.html) .
## Instrumenting Methods[](#instrumenting-methods "Permalink")
使用`Gitlab::Metrics::Instrumentation`模块可以完成检测方法. 该模块提供了几种可用于检测代码的方法:
* `instrument_method` :检测单个类方法.
* `instrument_instance_method` :检测单个实例方法.
* `instrument_class_hierarchy` :给定一个 Class,此方法将递归地检测所有子类(类方法和实例方法).
* `instrument_methods` :检测模块的所有公共和私有类方法.
* `instrument_instance_methods` :检测模块的所有公共和私有实例方法.
为了消除键入完整的`Gitlab::Metrics::Instrumentation`命名空间的需要,您可以使用`configure`类方法. 通过传递`Gitlab::Metrics::Instrumentation`作为其参数时,此方法仅产生提供的块. 一个例子:
```
Gitlab::Metrics::Instrumentation.configure do |conf|
conf.instrument_method(Foo, :bar)
conf.instrument_method(Foo, :baz)
end
```
通常,使用此方法优于直接调用各种检测方法.
方法检测应添加到初始化程序`config/initializers/zz_metrics.rb` .
### Examples[](#examples "Permalink")
检测单个方法:
```
Gitlab::Metrics::Instrumentation.configure do |conf|
conf.instrument_method(User, :find_by)
end
```
检测整个类的层次结构:
```
Gitlab::Metrics::Instrumentation.configure do |conf|
conf.instrument_class_hierarchy(ActiveRecord::Base)
end
```
检测所有公共类方法:
```
Gitlab::Metrics::Instrumentation.configure do |conf|
conf.instrument_methods(User)
end
```
### Checking Instrumented Methods[](#checking-instrumented-methods "Permalink")
检查一种方法是否已被检测的最简单方法是检查其源位置. 例如:
```
method = Banzai::Renderer.method(:render)
method.source_location
```
如果源位置指向`lib/gitlab/metrics/instrumentation.rb` ,则说明该方法已经过检测.
如果使用的是 Pry,则可以使用`$`命令显示方法的源代码(及其源位置),这比运行上面的 Ruby 代码容易. 如果是上述片段,请运行以下代码:
* `$ Banzai::Renderer.render`
这将打印出以下内容:
```
From: /path/to/your/gitlab/lib/gitlab/metrics/instrumentation.rb @ line 148:
Owner: #<Module:0x0055f0865c6d50>
Visibility: public
Number of lines: 21
def #{name}(#{args_signature})
if trans = Gitlab::Metrics::Instrumentation.transaction
trans.measure_method(#{label.inspect}) { super }
else
super
end
end
```
## Instrumenting Ruby Blocks[](#instrumenting-ruby-blocks "Permalink")
通过调用`Gitlab::Metrics.measure`并将其传递给块来完成对 Ruby 代码块的测量. 例如:
```
Gitlab::Metrics.measure(:foo) do
...
end
```
执行该块并将执行时间存储为当前运行的事务中的一组字段. 如果不存在事务,则不进行任何测量就产生该块.
测量一个块的三个值:
* 经过的实时时间,存储在`NAME_real_time` .
* The CPU time elapsed, stored in `NAME_cpu_time`.
* 通话次数,存储在`NAME_call_count` .
实时和 CPU 计时均以毫秒为单位.
多次调用同一块将导致最终值是所有单个值的总和. 以下面的代码为例:
```
3.times do
Gitlab::Metrics.measure(:sleep) do
sleep 1
end
end
```
在这里, `sleep_real_time`的最终值为`3` , *而不是* `1` .
## Tracking Custom Events[](#tracking-custom-events "Permalink")
除了检测代码,GitLab Performance Monitoring 还支持跟踪自定义事件. 这主要用于跟踪业务指标,例如 Git 推送数,存储库导入等.
要跟踪自定义事件,只需调用`Gitlab::Metrics.add_event`传递事件名称和一组自定义(可选)标签. 例如:
```
Gitlab::Metrics.add_event(:user_login, email: current_user.email)
```
事件名称应为动词,例如`push_repository`和`remove_branch` .
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