Function Apps To Log Analytics

Description:

Follow these steps to get your Function App custom logs to show up in Log Analytics

To Resolve:

1. Inside your Function App, go to Diagnostic Settings and have it send all of its logs to Log Analytics just like any other resource

2. Inside App Insights go to Properties and make sure it is pointing to log analytics

3. If you want to see the output of a log, you have two places to go for now:

   • Inside Application Insights => Logs => you can type traces and run. It should have your python logging.info("something") statements
   • Example for a function called GetProcessID:

   traces
   | where customDeminsions.Category == "Function.GetProcessID.User"
   

   • Inside Log Analytics => Logs => you can type FunctionAppLogs and run. It should have your python logging.info("something") statements

   FunctionAppLogs
   | where FunctionName == "GetProcessID"
   
   # another example to get Exceptions
   FunctionAppLogs
   | where ExceptionDetails != ""  
   | order by TimeGenerated asc
   
   

4. Actually, for best results, I have been typing AppTraces in Log Analytics to get my logging statement outputs.

  AppTraces
  | where OperationName == "Get-Status"
  | where TimeGenerated > ago(20m)
  | sort by TimeGenerated desc 
  | project TimeGenerated, Message, OperationId

  # Variation you could try:
  AppTraces
  | where OperationName == "Get-Status"
  | where TimeGenerated > ago(20m)
  | sort by TimeGenerated desc 
  | summarize by OperationId, TimeGenerated, Message