# Monitoring

## Introduction monitoring handler aim to monitor traffics of server side microservice see how to export metrics to prometheus [observable](https://go-chassis.readthedocs.io/en/latest/user-guides/metrics.html)

it records 3 different metrics: - request_count - request_process_duration - error_response_count

## Usage

1.Import it in your main file `go import _ github.com/go-chassis/go-chassis/v2/middleware/monitoring `

2. you must set monitoring handler in chain provider chain , here is a example ```yaml handler:

   chain:

   Provider:

   default: monitoring

   ```

metrics API response looks like below： `text # HELP request_count # TYPE request_count counter request_count{app="default",env="",instance="",service="servicecomb-kie",version="0.1.0"} 14 # HELP request_process_duration # TYPE request_process_duration summary request_process_duration{app="default",env="",instance="",service="servicecomb-kie",version="0.1.0",quantile="0.5"} 3 request_process_duration{app="default",env="",instance="",service="servicecomb-kie",version="0.1.0",quantile="0.9"} 80 request_process_duration{app="default",env="",instance="",service="servicecomb-kie",version="0.1.0",quantile="0.99"} 80 request_process_duration_sum{app="default",env="",instance="",service="servicecomb-kie",version="0.1.0"} 315 request_process_duration_count{app="default",env="",instance="",service="servicecomb-kie",version="0.1.0"} 14 `