Is TimeGenerated the same as the timestamp generated by ILogger log.information?

Question

I am unclear from the document whether TimeGenerated in a Log Analytics query matches the timestamp (e.g. below generated from ILogger log.information shown in a Function app Monitor?), i.e. I can look at the timestamp of Function app Monitor and query Log Analytics to get the data for the timestamp I saw on monitor?

2022-11-25T15:33:56.381 [Information] Executed 'TelemetryListenerCalculateAlgoPostNewState' (Succeeded, Id=3343886c-90e8-4ea7-b15f-5e1a42b47ff8, Duration=130ms)  

versus

Answer 1

@Sergio Solorzano Thanks for reaching out. TimeGenerated property is the Record created at data source. If the data source doesn't set this value, then it will be set to the same time as _TimeReceived. For more details refer to this section.

When you use log.Information inside the function app then the TimeGenerated property is set as the time of the log as I can see in the below test. The same is documented here.

TimeGenerate : The timestamp (UTC) of the log.

Answer 2

Hi there,

It should if the data source has delivered the data to both destinations parallelly

The TimeGenerated column contains the date and time that the record was created by the data source. See Log data ingestion time in Azure Monitor for more details.