AzureMetrics
| where ResourceProvider == 'MICROSOFT.DATAFACTORY'
| where Resource == 'xxx'
| where MetricName == 'IntegrationRuntimeAvailableMemory'
| project TimeGenerated, Average
| order by TimeGenerated asc
| render timechart
You question / issue relates to Azure Monitor - not for KQL parser.
You will need to contact Azure Monitor team, or submit question for Azure Monitor repo / channel.
Based in the manual this metric must be AVG Link![image](https://user-images.githubusercontent.com/15262462/150646691-1e49fba5-8bba-4896-adce-c46bb16e47a8.png)
But I suspect that is not true:![image](https://user-images.githubusercontent.com/15262462/150646726-89ff4fb8-1ed2-43db-b9da-5378a58441e6.png)