usage

#step 1: install redis
docker run -itd --name my-redis -p 6379:6379 redis

#step 2: install prometheus
mkdir -p /home/prometheus
vi /home/prometheus/prometheus.yml
```
global:
  scrape_interval:     30s
  evaluation_interval: 30s
scrape_configs:
  - job_name: prometheus
    static_configs:
      - targets: ['172.17.0.1:9090']
        labels:
          instance: prometheus
  - job_name: ycache
    metrics_path: /metrics
    static_configs:
      - targets: ['172.17.0.1:10001']
```
docker run -itd --name prometheus -p 9090:9090 \
-v /home/prometheus/prometheus.yml:/etc/prometheus/prometheus.yml \
-v /etc/localtime:/etc/localtime:ro \
prom/prometheus

#step 3: install grafana
docker run -itd \
--user root \
-p 3000:3000 \
--name=grafana \
-v /home/grafana:/var/lib/grafana \
grafana/grafana


#step 4: build demo program
go build -o app ./demo/main.go
nohup ./app &

#step 5: use curl to test http request ok
curl -X POST http://127.0.0.1:10001/benchmark -d '{"user_id":"1"}'

#step 6: benchmark api and get detail in grafana
go run ./demo/test/benchmark_client.go