feat: add reputation

[StefanLobbenmeierObjego]

Fix #37

[StefanLobbenmeierObjego]

Since it is unlikely the maintainer merges this / they seem to be inactive in this repo I went ahead and pushed to my own docker hub:

docker.io/stefanlobbenmeierobjego/sendgrid-stats-exporter:add-reputation

Also in case anyone ever needs it, this is a Kubernetes deployment if you do not want to configure prometheus directly but need to work with labels, feel free to reuse it, publishing it as https://unlicense.org here:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: sendgrid-stats-exporter
  labels:
    app: objego
    service: sendgrid-stats-exporter
spec:
  selector:
    matchLabels:
      app: objego
      service: sendgrid-stats-exporter
  template:
    metadata:
      labels:
        app: objego
        service: sendgrid-stats-exporter
      annotations:
        "k8s.grafana.com/scrape": "true"
        "k8s.grafana.com/metrics.portNumber": "9154"
        "k8s.grafana.com/metrics.path": "/metrics"
    spec:
      containers:
        - name: sendgrid-stats-exporter
          image: docker.io/stefanlobbenmeierobjego/sendgrid-stats-exporter:add-reputation
          imagePullPolicy: Always
          env:
            - name: DISABLE_EXPORTER_METRICS
              value: "true"
          envFrom:
            - secretRef:
                name: sendgrid-stats-exporter-secret
          ports:
            - containerPort: 9154
          resources:
            requests:
              cpu: "50m"
              memory: "10Mi"
            limits:
              memory: "10Mi"
          startupProbe:
            httpGet:
              path: /-/healthy
              port: 9154
            initialDelaySeconds: 1
            periodSeconds: 1
            failureThreshold: 20
          readinessProbe:
            httpGet:
              path: /-/healthy
              port: 9154
            periodSeconds: 10
            failureThreshold: 3
          livenessProbe:
            httpGet:
              path: /-/healthy
              port: 9154
            periodSeconds: 10
            failureThreshold: 9