# Prometheus sample code

This is a sample main that will use the custom doczy prometheus library to expose some typical 
metrics.   

`task compose:up:test` (to start prometheus)
Then run
`go run ./cmd/metricsExample_test/main.go`
to start the metrics example server. 

Prometheus console is at http://localhost:9090/

## Example queries for the
Use these queries in the prometheus console to see the metrics from the sample main.go

### Total requests per endpoint (rate over 5m)
rate(myapp_api_api_requests_total[5m])

### Request rate by status code
sum by (status) (rate(myapp_api_api_requests_total[5m]))

### Request rate by method
sum by (method) (rate(myapp_api_api_requests_total[5m]))

### Current active users by type
myapp_api_active_users

### Total active users across all types
sum(myapp_api_active_users)

## Histograms
### 95th percentile request duration by endpoint
histogram_quantile(0.95, sum(rate(myapp_api_request_duration_seconds_bucket[5m])) by (endpoint, le))

### Average request duration
rate(myapp_api_request_duration_seconds_sum[5m]) / rate(myapp_api_request_duration_seconds_count[5m])

### Request duration heatmap (if you have Grafana)
myapp_api_request_duration_seconds_bucket