Files I produced during the "Observability / Prometheus" classes of my Microservices Full Cycle 3.0 course (pt-br).
docker-compose up # Run all servicesAccess http://localhost:9090.
If you wanna see prometheus metrics of itself, access http://localhost:9090/metrics.
Example of a graph I created to track the number of requests prometheus made to its /metrics endpoint:
Access http://localhost:8080/metrics
Docker containers metrics of your machine from cadvisor
Access http://localhost:3000
User: admin, Pass: admin
Import cadvisor dashboard, id: 14282
Enter inside the Golang application container
docker-compose exec app bashRun these commands:
go get github.com/prometheus/client_golang/prometheus
go get github.com/prometheus/client_golang/prometheus/promhttp
go run main.goOpen another terminal outside the container and run:
for i in {1..20}; do curl localhost:8181; done # Run curl 20 times
curl localhost:8181/metricsThe output should be similar to:
# HELP goapp_http_request_duration Duration in seconds of all HTTP requests
# TYPE goapp_http_request_duration histogram
goapp_http_request_duration_bucket{handler="Home",le="0.005"} 20
goapp_http_request_duration_bucket{handler="Home",le="0.01"} 20
goapp_http_request_duration_bucket{handler="Home",le="0.025"} 20
goapp_http_request_duration_bucket{handler="Home",le="0.05"} 20
goapp_http_request_duration_bucket{handler="Home",le="0.1"} 20
goapp_http_request_duration_bucket{handler="Home",le="0.25"} 20
goapp_http_request_duration_bucket{handler="Home",le="0.5"} 20
goapp_http_request_duration_bucket{handler="Home",le="1"} 20
goapp_http_request_duration_bucket{handler="Home",le="2.5"} 20
goapp_http_request_duration_bucket{handler="Home",le="5"} 20
goapp_http_request_duration_bucket{handler="Home",le="10"} 20
goapp_http_request_duration_bucket{handler="Home",le="+Inf"} 20
goapp_http_request_duration_sum{handler="Home"} 0.00023509399999999996
goapp_http_request_duration_count{handler="Home"} 20
# HELP goapp_http_requests_total Count of all http requests for goapp
# TYPE goapp_http_requests_total counter
goapp_http_requests_total 20
# HELP goapp_online_users Online users
# TYPE goapp_online_users gauge
goapp_online_users{logged_users="true"} 1375
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