Prometheus Dropping Port

grafana.json

{
  "annotations": {
    "list": []
  },
  "editable": true,
  "gnetId": null,
  "graphTooltip": 0,
  "hideControls": false,
  "id": null,
  "links": [],
  "rows": [
    {
      "collapse": false,
      "height": "250px",
      "panels": [],
      "repeat": null,
      "repeatIteration": null,
      "repeatRowId": null,
      "showTitle": false,
      "title": "Dashboard Row",
      "titleSize": "h6"
    }
  ],
  "schemaVersion": 14,
  "style": "dark",
  "tags": [],
  "templating": {
    "list": [
      {
        "current": {
          "text": "prometheus",
          "value": "prometheus"
        },
        "hide": 0,
        "label": null,
        "name": "datasource",
        "options": [],
        "query": "prometheus",
        "refresh": 1,
        "regex": "",
        "type": "datasource"
      },
      {
        "allValue": null,
        "current": {},
        "datasource": "${DS_PROMETHEUS}",
        "hide": 0,
        "includeAll": false,
        "label": null,
        "multi": false,
        "name": "instance",
        "options": [],
        "query": "label_values(node_load1, instance)",
        "refresh": 1,
        "regex": "([^\\\"]+):9100",
        "sort": 0,
        "tagValuesQuery": "",
        "tags": [],
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      }
    ]
  },
  "time": {
    "from": "now-6h",
    "to": "now"
  },
  "timepicker": {
    "refresh_intervals": [
      "5s",
      "10s",
      "30s",
      "1m",
      "5m",
      "15m",
      "30m",
      "1h",
      "2h",
      "1d"
    ],
    "time_options": [
      "5m",
      "15m",
      "1h",
      "6h",
      "12h",
      "24h",
      "2d",
      "7d",
      "30d"
    ]
  },
  "timezone": "",
  "title": "New dashboard Copy",
  "version": 1
}

prometheus.yml

scrape_configs:
  - job_name: '{{ jobname }}'
    relabel_configs:
    - source_labels: [__address__]
      target_label: instance
      regex:  "(.*):.*"