22-goa-logging-metrics/

Add Logging and Metrics

Add logging and metrics reporting to the goa app built in the previous exercise.

Logging Packages

Use one of:

• log15
• go-kit
• logrus

Setup the service using WithLogger. See http://goa.design/implement/logging/.

Metrics

Use graphite and grafana to trace metrics reported by statsd. https://github.com/kamon-io/docker-grafana-graphite contains a nice self-contained docker image:

docker run \
  --detach \
   --publish=80:80 \
   --publish=81:81 \
   --publish=8125:8125/udp \
   --publish=8126:8126 \
   --name kamon-grafana-dashboard \
   kamon/grafana_graphite

Setup the metrics sink to use statsd running on localhost on port 8125 if using the docker image above. See https://github.com/goadesign/goa/blob/master/metrics.go.

goa sends metrics for each error and response by default.

Generating Data

The solution directory contains a client tool that sends continuous traffic to the service.

Compile and run it with:

cd solution/tool/goworkshop-cli
go build
./goworkshop-cli siege