error :*"tsdb.HandleRequest() error invalid value type" in Grafana alert config

hi, all

I have one question about grafana alert system.

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the graph is fine,

metric : node_load1{instance=“big5db”}

but when I use “alert config” using this graph, there is some error.

error : “tsdb.HandleRequest() error invalid value type”

could I know why this error ouccured?

thanks.

this issue can be resolved in grafana 4.6.2 version.

so we need to upgrade grafana in pmm docker.