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APIM Event Hubs are recommended for logging through APIM. Do you know if this approach can capture invalid request info? I know that invalid request info can be captured through Azure Diagnostics but I'm wondering if I can capture this information
through an EventHubs-only solution or if I'll need to implement an additional solution through Azure Diagnostics to capture invalid request info?

I am logging using eventhub like that:
<on-error>
<log-to-eventhub logger-id="IgniteLogger001">
#( string.Join(",", context.LastError.Message, context.LastError.Reason, DateTime.UtcNow ) )
</log-to-eventhub>
</on-error>
Look this link: https://msdn.microsoft.com/en-us/library/azure/mt629506.aspx
You have a few error information available using context.LastError
Regards,

Greetings,
I am not sure about how much this will help but I found this below links which may help you on this.
https://azure.microsoft.com/en-in/documentation/articles/api-management-howto-log-event-hubs/
https://github.com/Azure/azure-content/commit/5aab2723a6fc127a07cf626ff274db3b7c387cfc
https://github.com/Azure/azure-content/commit/ebe7bcd9383f068c0177fe03303a2bf3a1ac8003
Regards,

I am logging using eventhub like that:
<on-error>
<log-to-eventhub logger-id="IgniteLogger001">
#( string.Join(",", context.LastError.Message, context.LastError.Reason, DateTime.UtcNow ) )
</log-to-eventhub>
</on-error>
Look this link: https://msdn.microsoft.com/en-us/library/azure/mt629506.aspx
You have a few error information available using context.LastError
Regards,