Azure.Messaging.EventHubs 5.1.0-preview.1

• .NETStandard 2.0

  • Azure.Core (>= 1.2.0)
  • Microsoft.Azure.Amqp (>= 2.4.2 && < 3.0.0)
  • Microsoft.Bcl.AsyncInterfaces (>= 1.0.0)
  • System.Diagnostics.DiagnosticSource (>= 4.6.0)
  • System.Reflection.TypeExtensions (>= 4.5.1 && < 4.9.0)
  • System.Runtime.Serialization.Primitives (>= 4.3.0)
  • System.Threading.Channels (>= 4.6.0)
  • System.Threading.Tasks.Extensions (>= 4.5.2)

### Acknowledgments
Thank you to our developer community members who helped to make the Event Hubs client libraries better with their contributions to this release:
- Alberto De Natale _([GitHub](https://github.com/albertodenatale))_
- Christopher Scott _([GitHub](https://github.com/christothes))_
#### Consuming events
- A new primitive, `EventProcessor<TPartition>`, has been implemented to serve as an extensibility point for creating a custom event processor instance.  It offers built-in fault tolerance, load balancing, and structure while allowing tuning for low-level network configuration, processing of events in batches, and customization for the storage of checkpoints.  More detail can be found in the [design proposal](https://github.com/Azure/azure-sdk-for-net/blob/master/sdk/eventhub/Azure.Messaging.EventHubs/design/event-processor%7BT%7D-proposal.md).
- A new primitive, `PartitionProcessor`, has been implemented to serve as a low-level means of reading batches of events from a single partition with greater control over network configuration.  More detail can be found in the [design proposal](https://github.com/Azure/azure-sdk-for-net/blob/master/sdk/eventhub/Azure.Messaging.EventHubs/design/partition-receiver-proposal.md).
#### Publishing events
- Event batches are now protected against modification while publishing is actively taking place.
#### Bug fixes and foundation
- Exceptions surfaced will now properly remember their context in all scenarios; previously, some deferred cases unintentionally reset the context.
- Validation for the Event Hubs fully qualified namespace has been improved, allowing for more deterministic failures when creating clients.
- The diagnostic scope for activities will now complete in a more deterministic manner.  (A community contribution, courtesy of [christothes]((https://github.com/christothes)))
- Diagnostic activities have been extended with additional information about events being processed and with additional environmental context.
- Parsing of connection strings is now more permissive for the `Endpoint` key, allowing additional formats that result from common mistakes when building the string rather than copying the value from the portal.
- `LastEnqueuedEventProperties` can now be compared for structural equality.
#### Testing
- For special cases, the live tests may be instructed to use existing Azure resources instead of dynamically creating dedicated resources for the run.  (A community contribution, courtesy of [albertodenatale](https://github.com/albertodenatale))

https://github.com/Azure/azure-sdk-for-net/blob/e85d6412c147037eeae098c76ca30ba1968882f6/sdk/eventhub/Azure.Messaging.EventHubs/CHANGELOG.md