Zabbix / Grafana 5 New Hosts Not Showing in Grafana

I have existing dashboards that work fine in 4.x and now 5.x. Hosts that existed in Zabbix previously work fine. However, when I add new hosts to the host groups, they appear in Grafana queries but always report no data / metrics and they don’t show up in my existing panels when using regex or choosing them by themselves. For example, I have network probes named “Network Probe - R1229” (existed previously) and “Network Probe - R3139” (added to Zabbix today). They are configured the same in Zabbix and both show data collecting. In Grafana 5, I can query and choose the new probe (R3139) but it always states “no data points” and when using regex to display them all (/.*Probe/) only the existing ones show. They are using the same template in Zabbix. This is one example, but I am seeing this with other dashboards and panels.

I have verified the hosts are enabled in Zabbix as well.

DASHBOARD JSON: (links removed)

{
  "annotations": {
    "list": [
      {
        "$$hashKey": "object:2042",
        "builtIn": 1,
        "datasource": "-- Grafana --",
        "enable": true,
        "hide": true,
        "iconColor": "rgba(0, 211, 255, 1)",
        "name": "Annotations & Alerts",
        "type": "dashboard"
      }
    ]
  },
  "description": "",
  "editable": true,
  "gnetId": 1760,
  "graphTooltip": 0,
  "id": 52,
  "iteration": 1524800841937,
  "links": [
    {
      "asDropdown": true,
      "icon": "external link",
      "includeVars": false,
      "keepTime": false,
      "tags": [],
      "targetBlank": true,
      "title": "DASHBOARDS",
      "type": "dashboards"
    },
  
  ],
  "panels": [
    {
      "aliasColors": {},
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": "Zabbix",
      "fill": 1,
      "gridPos": {
        "h": 8,
        "w": 24,
        "x": 0,
        "y": 0
      },
      "id": 2,
      "legend": {
        "alignAsTable": true,
        "avg": true,
        "current": true,
        "max": true,
        "min": true,
        "rightSide": true,
        "show": true,
        "sort": "current",
        "sortDesc": true,
        "total": false,
        "values": true
      },
      "lines": true,
      "linewidth": 1,
      "links": [],
      "maxDataPoints": "",
      "nullPointMode": "null",
      "percentage": false,
      "pointradius": 5,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "application": {
            "filter": "OS"
          },
          "functions": [],
          "group": {
            "filter": "$group"
          },
          "host": {
            "filter": "/.*Probe/"
          },
          "item": {
            "filter": "Response Time"
          },
          "mode": 0,
          "options": {
            "showDisabledItems": false
          },
          "refId": "A",
          "resultFormat": "time_series",
          "table": {
            "skipEmptyValues": false
          },
          "triggers": {
            "acknowledged": 2,
            "count": true,
            "minSeverity": 3
          }
        }
      ],
      "thresholds": [
        {
          "colorMode": "critical",
          "fill": true,
          "fillColor": "#629e51",
          "line": true,
          "lineColor": "#447ebc",
          "op": "gt",
          "value": 50
        }
      ],
      "timeFrom": null,
      "timeShift": null,
      "title": "Wireless Probes: Response Times",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
      "type": "graph",
      "xaxis": {
        "buckets": null,
        "mode": "time",
        "name": null,
        "show": true,
        "values": []
      },
      "yaxes": [
        {
          "format": "ms",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        },
        {
          "format": "short",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        }
      ]
    },
    {
      "aliasColors": {},
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": "Zabbix",
      "fill": 1,
      "gridPos": {
        "h": 8,
        "w": 24,
        "x": 0,
        "y": 8
      },
      "id": 1,
      "legend": {
        "alignAsTable": true,
        "avg": true,
        "current": true,
        "max": true,
        "min": true,
        "rightSide": true,
        "show": true,
        "total": false,
        "values": true
      },
      "lines": true,
      "linewidth": 1,
      "links": [],
      "nullPointMode": "null",
      "percentage": false,
      "pointradius": 5,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "application": {
            "filter": "OS"
          },
          "functions": [],
          "group": {
            "filter": "$group"
          },
          "host": {
            "filter": "/.Probe*/"
          },
          "item": {
            "filter": "Packet Loss"
          },
          "mode": 0,
          "options": {
            "showDisabledItems": false
          },
          "refId": "A",
          "resultFormat": "time_series",
          "table": {
            "skipEmptyValues": false
          },
          "triggers": {
            "acknowledged": 2,
            "count": true,
            "minSeverity": 3
          }
        }
      ],
      "thresholds": [
        {
          "colorMode": "critical",
          "fill": true,
          "line": true,
          "op": "gt",
          "value": 10
        }
      ],
      "timeFrom": null,
      "timeShift": null,
      "title": "Wireless Probes: Packet Loss",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
      "type": "graph",
      "xaxis": {
        "buckets": null,
        "mode": "time",
        "name": null,
        "show": true,
        "values": []
      },
      "yaxes": [
        {
          "format": "percent",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        },
        {
          "format": "short",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        }
      ]
    },
    {
      "aliasColors": {},
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": "Zabbix",
      "fill": 1,
      "gridPos": {
        "h": 7,
        "w": 24,
        "x": 0,
        "y": 16
      },
      "id": 3,
      "legend": {
        "alignAsTable": true,
        "avg": true,
        "current": true,
        "max": true,
        "min": true,
        "rightSide": true,
        "show": true,
        "total": false,
        "values": true
      },
      "lines": true,
      "linewidth": 1,
      "links": [],
      "nullPointMode": "null",
      "percentage": false,
      "pointradius": 5,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "application": {
            "filter": "OS"
          },
          "functions": [],
          "group": {
            "filter": "Probes"
          },
          "host": {
            "filter": "INTERNET"
          },
          "item": {
            "filter": "Packet Loss"
          },
          "mode": 0,
          "options": {
            "showDisabledItems": false
          },
          "refId": "A",
          "resultFormat": "time_series",
          "table": {
            "skipEmptyValues": false
          },
          "triggers": {
            "acknowledged": 2,
            "count": true,
            "minSeverity": 3
          }
        },
        {
          "application": {
            "filter": "OS"
          },
          "functions": [],
          "group": {
            "filter": "Probes"
          },
          "host": {
            "filter": "INTERNET"
          },
          "item": {
            "filter": "Response Time"
          },
          "mode": 0,
          "options": {
            "showDisabledItems": false
          },
          "refId": "B",
          "resultFormat": "time_series",
          "table": {
            "skipEmptyValues": false
          },
          "triggers": {
            "acknowledged": 2,
            "count": true,
            "minSeverity": 3
          }
        }
      ],
      "thresholds": [],
      "timeFrom": null,
      "timeShift": null,
      "title": "Internet Probe (8.8.8.8)",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
      "type": "graph",
      "xaxis": {
        "buckets": null,
        "mode": "time",
        "name": null,
        "show": true,
        "values": []
      },
      "yaxes": [
        {
          "format": "ms",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        },
        {
          "format": "short",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        }
      ]
    },
    {
      "aliasColors": {},
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": "Zabbix",
      "fill": 1,
      "gridPos": {
        "h": 7,
        "w": 24,
        "x": 0,
        "y": 23
      },
      "id": 4,
      "legend": {
        "alignAsTable": true,
        "avg": true,
        "current": true,
        "max": true,
        "min": true,
        "rightSide": true,
        "show": true,
        "total": false,
        "values": true
      },
      "lines": true,
      "linewidth": 1,
      "links": [],
      "nullPointMode": "null",
      "percentage": false,
      "pointradius": 5,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "application": {
            "filter": "OS"
          },
          "functions": [],
          "group": {
            "filter": "Probes"
          },
          "host": {
            "filter": "VTCRI WAN"
          },
          "item": {
            "filter": "Packet Loss"
          },
          "mode": 0,
          "options": {
            "showDisabledItems": false
          },
          "refId": "A",
          "triggers": {
            "acknowledged": 2,
            "count": true,
            "minSeverity": 3
          }
        },
        {
          "application": {
            "filter": "OS"
          },
          "functions": [],
          "group": {
            "filter": "Probes"
          },
          "host": {
            "filter": "VTCRI WAN"
          },
          "item": {
            "filter": "Response Time"
          },
          "mode": 0,
          "options": {
            "showDisabledItems": false
          },
          "refId": "B",
          "triggers": {
            "acknowledged": 2,
            "count": true,
            "minSeverity": 3
          }
        }
      ],
      "thresholds": [],
      "timeFrom": null,
      "timeShift": null,
      "title": "VTCRI WAN (VT Address)",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
      "type": "graph",
      "xaxis": {
        "buckets": null,
        "mode": "time",
        "name": null,
        "show": true,
        "values": []
      },
      "yaxes": [
        {
          "format": "ms",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        },
        {
          "format": "short",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        }
      ]
    },
    {
      "aliasColors": {},
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": "Zabbix",
      "fill": 1,
      "gridPos": {
        "h": 7,
        "w": 24,
        "x": 0,
        "y": 30
      },
      "id": 5,
      "legend": {
        "alignAsTable": true,
        "avg": false,
        "current": true,
        "max": false,
        "min": false,
        "rightSide": true,
        "show": true,
        "total": false,
        "values": true
      },
      "lines": true,
      "linewidth": 1,
      "links": [],
      "nullPointMode": "null",
      "percentage": false,
      "pointradius": 5,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "application": {
            "filter": "Misc"
          },
          "functions": [],
          "group": {
            "filter": "Linux servers"
          },
          "host": {
            "filter": "IT-PRD-ZAB01"
          },
          "item": {
            "filter": "Incoming Email"
          },
          "mode": 2,
          "options": {
            "showDisabledItems": false
          },
          "refId": "A",
          "resultFormat": "time_series",
          "table": {
            "skipEmptyValues": false
          },
          "triggers": {
            "acknowledged": 2,
            "count": true,
            "minSeverity": 3
          }
        }
      ],
      "thresholds": [],
      "timeFrom": null,
      "timeShift": null,
      "title": "INCOMING EMAIL CHECKER",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
      "type": "graph",
      "xaxis": {
        "buckets": null,
        "mode": "time",
        "name": null,
        "show": true,
        "values": []
      },
      "yaxes": [
        {
          "decimals": 0,
          "format": "short",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        },
        {
          "decimals": null,
          "format": "short",
          "label": null,
          "logBase": 1,
          "max": null,
          "min": null,
          "show": true
        }
      ]
    }
  ],
  "refresh": false,
  "schemaVersion": 16,
  "style": "dark",
  "tags": [
    "zabbix"
  ],
  "templating": {
    "list": [
      {
        "allValue": null,
        "current": {
          "text": "Probes",
          "value": "Probes"
        },
        "datasource": "Zabbix",
        "hide": 0,
        "includeAll": false,
        "label": "Group",
        "multi": false,
        "name": "group",
        "options": [],
        "query": "*",
        "refresh": 1,
        "regex": "",
        "sort": 0,
        "tagValuesQuery": "",
        "tags": [],
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      },
      {
        "allValue": "",
        "current": {
          "text": "Network Probe - R1229 + Network Probe - R2137 + Network Probe - R2NC1 + Network Probe - R3139",
          "value": [
            "Network Probe - R1229",
            "Network Probe - R2137",
            "Network Probe - R2NC1",
            "Network Probe - R3139"
          ]
        },
        "datasource": "Zabbix",
        "hide": 0,
        "includeAll": true,
        "label": "Host",
        "multi": true,
        "name": "host",
        "options": [],
        "query": "$group.*",
        "refresh": 1,
        "regex": "",
        "sort": 1,
        "tagValuesQuery": "",
        "tags": [],
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      }
    ]
  },
  "time": {
    "from": "2018-04-26T16:08:28.371Z",
    "to": "2018-04-26T16:50:32.357Z"
  },
  "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": "browser",
  "title": "NETWORK PROBES",
  "uid": "000000052",
  "version": 16
}

I assume you have double checked that Zabbix is collecting data for the items of new hosts.
In Grafana, in templating or variables setting, you should set the variable to be refreshed on dashboard load. Otherwise you will only see the hosts / items that were there when you created the dashboard.

Cheers