OpenTelemetry Integration (#96)

* provides useful OTel metrics and a selection of exports
* adds helpful grafana dashboard for viewing metrics exported by prometheus

_otel/docker-compose.yml

@@ -0,0 +1,23 @@
+version: '3'
+services:
+  prometheus:
+    image: prom/prometheus:v2.21.0
+    ports:
+      - 9000:9090
+    volumes:
+      - ./prometheus:/etc/prometheus
+    command: --web.enable-lifecycle  --config.file=/etc/prometheus/prometheus.yml
+  grafana:
+    image: grafana/grafana:7.5.7
+    environment:
+      - GF_AUTH_DISABLE_LOGIN_FORM=true
+      - GF_AUTH_ANONYMOUS_ENABLED=true
+      - GF_AUTH_ANONYMOUS_ORG_ROLE=Admin
+    ports:
+      - 3000:3000
+    restart: unless-stopped
+    volumes:
+      - ./grafana/provisioning/datasources:/etc/grafana/provisioning/datasources
+      - ./grafana/provisioning/dashboards:/etc/grafana/provisioning/dashboards
+      - ./grafana/provisioning/dashboards/nex.json:/var/lib/grafana/dashboards/nex.json
+

_otel/grafana/provisioning/dashboards/dashboard.yml

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+apiVersion: 1
+providers:
+  - name: 'nex-dashboard'
+    updateIntervalSeconds: 10
+    allowUiUpdates: false
+    options:
+      path: /var/lib/grafana/dashboards