hermedia/prometheus-app-example repository overview

⁠Prometheus App Example

This example app serves as an example of how one can easily instrument HTTP handlers with Prometheus metrics. It uses the Prometheus go client to create a new Prometheus registry.

Usage is simple, on any request to / the request will result in a 200 response code.

This increments the counter for this response code.

Similarly the /err endpoint will result in a 404 response code, therefore increments that respective counter.

Duration metrics are also exposed for any request to /.

⁠Dockerfile:

FROM golang:alpine AS builder
RUN apk update && apk add --no-cache git
COPY src $GOPATH/src/prometheus-app-example
WORKDIR $GOPATH/src/prometheus-app-example
RUN go get -d -v
RUN go build -o /tmp/app-example *.go

FROM alpine
RUN addgroup -S appgroup && adduser -S appuser -G appgroup && mkdir -p /app 
COPY --from=builder /tmp/app-example /app
RUN chmod a+rx /app/app-example
USER appuser
WORKDIR /app
ENV LISTENING_PORT 8080
CMD ["./app-example"]