Azure allows one to store events in a Blob storage coming from an Azure Event hub. These are stores as Single-Objevt encoded avro files.
The specs: https://avro.apache.org/docs/1.8.2/spec.html#N104B8
This is currently not supported by the logstash avro codec.
There is a PR fore this, but it got closed, also see the last comment: https://github.com/logstash-plugins/logstash-codec-avro/pull/20