Unexpected Message Error in email alert notifications

[tmanh17]

Bug Report

Get error in email alert notifications:
tsdb.HandleRequest() response error &{json: cannot unmarshal object into Go struct field queryModel.group of type string json: cannot unmarshal object into Go struct field queryModel.group of type string A [] [] 0xc000eaf6b0}

Expected Behavior

Get the abnormal metric name and its value

Actual Behavior

Get the Error message tsdb.HandleRequest() response error &{json: cannot unmarshal object into Go struct field queryModel.group of type string json: cannot unmarshal object into Go struct field queryModel.group of type string A <nil> [] [] 0xc000eaf6b0} instead of the metric name and its value

Steps to Reproduce the Problem

1.create a new dashboard
2.create a panel with BigQuery plugin
3.create a BigQuery query
4.create an email channel and alert to that channel
5.check the email alert notification

Specifications

• Version: 2.0.1
• Platform: Debian 8.5
• Grafana Version: Grafana v7.4.2

[tmanh17]

Some logs

t=2021-04-29T17:06:16+0700 lvl=eror msg="Alert Rule Result Error" logger=alerting.evalContext ruleId=4 name=Alert error="tsdb.HandleRequest() error could not find executor for data source type: doitintl-bigquery-datasource" changing state to=alerting

t=2021-04-29T17:06:30+0700 lvl=eror msg="Alert Rule Result Error" logger=alerting.evalContext ruleId=5 name="Panel Title alert" error="tsdb.HandleRequest() error could not find executor for data source type: doitintl-bigquery-datasource" changing state to=alerting

[ofir5300]

Duplication of #301 which is solved by #322
Should work properly on the next plugin release v2.0.2