Architecture

Pepper Metrics项目从核心概念上来说，基于Tom Wilkie的RED理论，即对每个服务（这里的服务特指进程中的某种调用，比如调用一次数据库查询）进行RED指标收集，并持久化到数据库，并通过dashboard进行展示，辅助进行性能趋势分析。

Concept

Arch

各个组件说明

Profiler，核心部分，用于启动定期调度任务，并通过ExtensionLoad加载所有的ScheduledRun扩展，按照指定周期发起调度。同时内部维护Stats的构造器Profiler.Builder

Scheduler，虚拟概念，在Profiler作为一个定时任务存在

ExtensionLoader，非常重要的组件，通过Java SPI机制加载插件，使项目的各个模块可以灵活插拔，也是项目架构的基石

ScheduledRun，扩展点：pepper metrics core会定时调度，传递所有的Stats，实现插件可以使用Stats当中收集到的性能数据，目前已实现的为scheduled printer组件

Pepper Metrics X，具体的集成，我们的目标是度量一切，目前计划实现的为：jedis，motan，dubbo，servlet，mybatis等最常用组件

Getting started

以Mybatis集成为例，更多其他请参考：User Guide

增加maven依赖

<dependencies>
    <!-- pepper metrics dependencies -->
    <dependency>
        <groupId>top.zrbcool</groupId>
        <artifactId>pepper-metrics-mybatis</artifactId>
        <version>1.0.11</version>
    </dependency>
    <!-- pepper-metrics datasource use prometheus by default -->
    <dependency>
        <groupId>top.zrbcool</groupId>
        <artifactId>pepper-metrics-ds-prometheus</artifactId>
        <version>1.0.11</version>
    </dependency>
</dependencies>

配置Pepper Metrics定制的Mybatis插件使集成生效

<configuration>
    <typeAliases>
        ...
    </typeAliases>
    <!-- 加入如下配置 -->
    <plugins>
        <plugin interceptor="com.pepper.metrics.integration.mybatis.MybatisProfilerPlugin" />
    </plugins>
    <mappers>
        ...
    </mappers>
</configuration>

日志输出效果：

18:27:28 [perf-mybatis:20190822182728] ---------------------------------------------------------------------------------------------------------------------------------------------------------
18:27:28 [perf-mybatis:20190822182728] | Metrics                                                                     Concurrent Count(Err/Sum)   P90(ms)   P99(ms)  P999(ms)   Max(ms)     Qps | 
18:27:28 [perf-mybatis:20190822182728] | com.pepper.metrics.sample.mybatis.mapper.HotelMapper.selectByCityId                  0         0/1950       0.6       1.4       2.5       3.5    32.5 | 
18:27:28 [perf-mybatis:20190822182728] | sample.mybatis.mapper.CityMapper.selectCityById                                      0         0/1950       0.8       2.4      56.6      56.6    32.5 | 
18:27:28 [perf-mybatis:20190822182728] ---------------------------------------------------------------------------------------------------------------------------------------------------------

Prometheus指标输出效果（默认的实现，可以修改为其他数据库）

 ✗ curl localhost:9146/metrics
# HELP app_mapper_summary_seconds_max  
# TYPE app_mapper_summary_seconds_max gauge
app_mapper_summary_seconds_max{class="com/pepper/metrics/sample/mybatis/mapper/CityMapper.xml",operation="sample.mybatis.mapper.CityMapper.selectCityById",} 0.051129036
app_mapper_summary_seconds_max{class="com/pepper/metrics/sample/mybatis/mapper/HotelMapper.xml",operation="com.pepper.metrics.sample.mybatis.mapper.HotelMapper.selectByCityId",} 0.011559611
# HELP app_mapper_summary_seconds  
# TYPE app_mapper_summary_seconds summary
app_mapper_summary_seconds{class="com/pepper/metrics/sample/mybatis/mapper/CityMapper.xml",operation="sample.mybatis.mapper.CityMapper.selectCityById",quantile="0.9",} 5.5296E-4
app_mapper_summary_seconds{class="com/pepper/metrics/sample/mybatis/mapper/CityMapper.xml",operation="sample.mybatis.mapper.CityMapper.selectCityById",quantile="0.99",} 0.001765376
app_mapper_summary_seconds{class="com/pepper/metrics/sample/mybatis/mapper/CityMapper.xml",operation="sample.mybatis.mapper.CityMapper.selectCityById",quantile="0.999",} 0.052424704
app_mapper_summary_seconds{class="com/pepper/metrics/sample/mybatis/mapper/CityMapper.xml",operation="sample.mybatis.mapper.CityMapper.selectCityById",quantile="0.99999",} 0.052424704
app_mapper_summary_seconds_count{class="com/pepper/metrics/sample/mybatis/mapper/CityMapper.xml",operation="sample.mybatis.mapper.CityMapper.selectCityById",} 3040.0
app_mapper_summary_seconds_sum{class="com/pepper/metrics/sample/mybatis/mapper/CityMapper.xml",operation="sample.mybatis.mapper.CityMapper.selectCityById",} 1.45711331
app_mapper_summary_seconds{class="com/pepper/metrics/sample/mybatis/mapper/HotelMapper.xml",operation="com.pepper.metrics.sample.mybatis.mapper.HotelMapper.selectByCityId",quantile="0.9",} 4.4032E-4
app_mapper_summary_seconds{class="com/pepper/metrics/sample/mybatis/mapper/HotelMapper.xml",operation="com.pepper.metrics.sample.mybatis.mapper.HotelMapper.selectByCityId",quantile="0.99",} 0.001308672
app_mapper_summary_seconds{class="com/pepper/metrics/sample/mybatis/mapper/HotelMapper.xml",operation="com.pepper.metrics.sample.mybatis.mapper.HotelMapper.selectByCityId",quantile="0.999",} 0.002881536
app_mapper_summary_seconds{class="com/pepper/metrics/sample/mybatis/mapper/HotelMapper.xml",operation="com.pepper.metrics.sample.mybatis.mapper.HotelMapper.selectByCityId",quantile="0.99999",} 0.012056576
app_mapper_summary_seconds_count{class="com/pepper/metrics/sample/mybatis/mapper/HotelMapper.xml",operation="com.pepper.metrics.sample.mybatis.mapper.HotelMapper.selectByCityId",} 3040.0
app_mapper_summary_seconds_sum{class="com/pepper/metrics/sample/mybatis/mapper/HotelMapper.xml",operation="com.pepper.metrics.sample.mybatis.mapper.HotelMapper.selectByCityId",} 0.772147736
# HELP app_mapper_concurrent_gauge  
# TYPE app_mapper_concurrent_gauge gauge
app_mapper_concurrent_gauge{class="com/pepper/metrics/sample/mybatis/mapper/CityMapper.xml",operation="sample.mybatis.mapper.CityMapper.selectCityById",} 0.0
app_mapper_concurrent_gauge{class="com/pepper/metrics/sample/mybatis/mapper/HotelMapper.xml",operation="com.pepper.metrics.sample.mybatis.mapper.HotelMapper.selectByCityId",} 0.0

Maven dependency

以Mybatis为例，更多其他请参考：User Guide

<dependencies>
    <!-- pepper metrics dependencies -->
    <dependency>
        <groupId>top.zrbcool</groupId>
        <artifactId>pepper-metrics-mybatis</artifactId>
        <version>1.0.11</version>
    </dependency>
    <!-- pepper-metrics datasource use prometheus by default -->
    <dependency>
        <groupId>top.zrbcool</groupId>
        <artifactId>pepper-metrics-ds-prometheus</artifactId>
        <version>1.0.11</version>
    </dependency>
</dependencies>