Alerts not working

[tribuste]

Bug Report

When I tried to add alerting on created dashboard always getting error

Expected Behavior

Create alert working alert

Actual Behavior

When I hit test alert rule I'm getting "error": "tsdb.HandleRequest() error rpc error: code = Unavailable desc = transport is closing",

Steps to Reproduce the Problem

1.create a new dashboard
2.create a panel with google bigquery plugin
3.create a bigquery query
4.create an alert
5. test rule:

Specifications

Version:2.0.1
Platform:GKE k8s
Grafana Version: Grafana v7.3.4 (14c494085e)

{
  "firing": true,
  "state": "pending",
  "conditionEvals": " = true",
  "timeMs": "444.552ms",
  "error": "tsdb.HandleRequest() error rpc error: code = Unavailable desc = transport is closing",
  "logs": [
    {
      "message": "Condition[0]: Query",
      "data": {
        "from": 1609756651420,
        "queries": [
          {
            "refId": "A",
            "model": {
              "dataset": "xxxxxx_billing",
              "format": "time_series",
              "group": [],
              "location": "xxxxxxxxxx",
              "metricColumn": "none",
              "orderByCol": "1",
              "orderBySort": "1",
              "partitioned": true,
              "partitionedField": "",
              "project": "xxxxxxxxxx",
              "rawQuery": false,
              "rawSql": "SELECT\n  time_column,\n  value1\nFROM\n  metric_table\nWHERE\n  $__timeFilter(time_column)\n",
              "refId": "A",
              "select": [
                [
                  {
                    "params": [
                      "usage.amount"
                    ],
                    "type": "column"
                  }
                ]
              ],
              "sharded": false,
              "table": "gcp_billing_export_v1_xxxxxxx",
              "timeColumn": "usage_start_time",
              "timeColumnType": "TIMESTAMP",
              "where": [
                {
                  "name": "$__timeFilter",
                  "params": [],
                  "type": "macro"
                }
              ]
            },
            "datasource": {
              "id": 3,
              "name": "Bigquery"
            },
            "maxDataPoints": 0,
            "intervalMs": 0
          }
        ],
        "to": 1609756951420
      }
    }
  ]
}