@errordeveloper A Practical Guide to Prometheus for App Developers 

outline: – theory – tutorial 

Prometheus PromQL and alerts MyApp Prometheus GET /metrics remote_write Deploy App to Docker Swarm 

Prometheus: what is it? 

Prometheus: how it works? 

Prometheus: say more? 

> curl http://localhost:8080/metrics ... # HELP process_starttime_seconds The starttime of the Java virtual machine # TYPE process_starttime_seconds gauge process_starttime_seconds 1.506735317456E9 # HELP process_uptime_seconds The uptime of the Java virtual machine # TYPE process_uptime_seconds gauge process_uptime_seconds 145236.015 

> curl http://localhost:8080/metrics ... # HELP http_requests_duration_seconds Timer of servlet request # TYPE http_requests_duration_seconds summary http_requests_duration_seconds_count{method="GET",status=" 200",uri="/"} 2.0 http_requests_duration_seconds_sum{method="GET",status="20 0",uri="/"} 0.05230485 

process_uptime_seconds 

process_uptime_seconds{job=“myapp”} 

http_requests_duration_seconds_count 

http_requests_duration_seconds_count{ job=“myapp”, method=“GET”, uri=“/”, } 

sum( http_requests_duration_seconds_count{ job=“myapp”, method=“GET”, uri=“/”, } ) 

sum( rate( http_requests_duration_seconds_count{ job=“myapp”, method=“GET”, uri=“/”, }[1m] ) ) 

up 

up{job=“myapp"} 

sum( up{job=“myapp"} ) by (job) 

tutorial: step-by-step guide to Prometheus with Node.js http://github.com/errordeveloper/prom-nodejs-demo 

cloud.weave.works 

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