Bump to Go 1.20, update dependencies & optimise Dockerfile

Dockerfile

@@ -1,11 +1,16 @@
 # build stage
-FROM golang:1.9.3-alpine3.7
+FROM golang:1.20-alpine as builder
+RUN apk add --no-cache ca-certificates
 
-ADD . /go/src/github.com/banzaicloud/preemption-exporter
-WORKDIR /go/src/github.com/banzaicloud/preemption-exporter
-RUN go build -o /bin/preemption-exporter .
+WORKDIR /build
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
+    go build -ldflags '-extldflags "-static"' -o /bin/preemption-exporter .
 
-FROM alpine:latest
-RUN apk update && apk add ca-certificates && rm -rf /var/cache/apk/*
-COPY --from=0 /bin/preemption-exporter /bin
-ENTRYPOINT ["/bin/preemption-exporter"]
+FROM scratch
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt \
+     /etc/ssl/certs/ca-certificates.crt
+COPY --from=builder /bin/preemption-exporter /preemption-exporter
+
+EXPOSE 9189
+ENTRYPOINT ["/preemption-exporter"]

exporter/metadata.go

@@ -57,7 +57,7 @@ func (c *terminationExporter) get(path string) (string, error) {
 		return "", err
 	}
 	if resp.StatusCode == http.StatusNotFound {
-		return "", errors.New("endpoint not fount")
+		return "", errors.New("endpoint not found")
 	}
 	return string(body), nil
 }

go.mod

@@ -0,0 +1,26 @@
+module github.com/banzaicloud/preemption-exporter
+
+go 1.20
+
+require (
+	github.com/prometheus/client_golang v1.15.1
+	github.com/shirou/gopsutil v3.21.11+incompatible
+	github.com/sirupsen/logrus v1.9.0
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/prometheus/client_model v0.4.0 // indirect
+	github.com/prometheus/common v0.43.0 // indirect
+	github.com/prometheus/procfs v0.9.0 // indirect
+	github.com/stretchr/testify v1.8.2 // indirect
+	github.com/tklauser/go-sysconf v0.3.11 // indirect
+	github.com/tklauser/numcpus v0.6.0 // indirect
+	github.com/yusufpapurcu/wmi v1.2.2 // indirect
+	golang.org/x/sys v0.8.0 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
+)

go.sum

@@ -0,0 +1,60 @@
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
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+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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