Azure 日志查询显示空值

Question

目前，我正在 Azure 中构建一个监控，并在图表中进行日志查询。 到目前为止，这工作正常，但我有一个问题。如果我想在图表中显示零值，我就会遇到问题。 当我查询 Count 时，我只得到包含数据的值。

我尝试了以下方法来输出零值:

    customEvents
| where name == "GlobalHostHandleMessageError" and tolower(customDimensions.MessageType) in ("listmanager")
| where customDimensions.DeliveryCount == "10"
| project MessageType = customDimensions.MessageType, timestamp 
| summarize SumMessages=count() by tostring(MessageType), timestamp
| make-series count() default=0 on timestamp in range(ago(1d), now(), 1h) by MessageType
| mvexpand timestamp, count_

不幸的是，我无法在“make-series”命令之后显示图表。显示以下错误:

FAILED TO CREATE VISUALIZATION
The Pie can't be created as you are missing a column of one of the following types: int, long, decimal or real

谁能帮我解决这个问题吗？

提前致以问候和感谢

Answer 1

mvexpand 的输出始终是动态类型列。尝试将最后一行更改为:
mvexpand 时间戳，tolong(count_)。