[azsystemevents] First generation of package for Azure Event Grid system events

sdk/messaging/eventgrid/azsystemevents/CHANGELOG.md

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+## 0.1.0 (TBD)
+
+### Features Added
+
+- Initial preview for Event Grid system events.

sdk/messaging/eventgrid/azsystemevents/LICENSE.txt

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+MIT License
+
+Copyright (c) Microsoft Corporation.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

sdk/messaging/eventgrid/azsystemevents/README.md

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+# Azure Event Grid System Events Module for Go
+
+Azure Event Grid system events are published by Azure services to system topics. The models in this package map to events sent by various Azure services.
+
+Key links:
+- [Source code][source]
+- [API Reference Documentation][godoc]
+- [Product documentation][product_docs]
+- [Samples][godoc_examples]
+
+## Getting started
+
+### Install the package
+
+Install the Azure Event Grid system events module for Go with `go get`:
+
+```bash
+go get github.com/Azure/azure-sdk-for-go/sdk/messaging/eventgrid/azsystemevents
+```
+
+### Prerequisites
+
+- Go, version 1.18 or higher
+
+# Key concepts
+
+Event subscriptions can be used to forward events from an [Event Grid system topic][system_topics] to a data source, like [Azure Storage Queues][event_handler_storage_queues]. The payload will be formatted as an array of events, using the event envelope (Cloud Event Schema or Event Grid Schema) configured within the subscription.
+
+To consume events, use the client package for that service. For example, if the Event Grid subscription uses an an Azure Storage Queue, we would use the [azqeueue](https://pkg.go.dev/github.com/Azure/azure-sdk-for-go/sdk/storage/azqueue) package to consume it.
+
+# Examples
+
+Examples for deserializing system events can be found on [pkg.go.dev][godoc_examples] or in the example*_test.go files in our GitHub repo for [azsystemevents][source].
+
+# Troubleshooting
+
+### Logging
+
+This module uses the classification-based logging implementation in `azcore`. To enable console logging for all SDK modules, set the environment variable `AZURE_SDK_GO_LOGGING` to `all`. 
+
+Use the `azcore/log` package to control log event output.
+
+```go
+import (
+  "fmt"
+  azlog "github.com/Azure/azure-sdk-for-go/sdk/azcore/log"
+)
+
+// print log output to stdout
+azlog.SetListener(func(event azlog.Event, s string) {
+    fmt.Printf("[%s] %s\n", event, s)
+})
+```
+
+# Next steps
+
+More sample code should go here, along with links out to the appropriate example tests.
+
+## Contributing
+For details on contributing to this repository, see the [contributing guide][azure_sdk_for_go_contributing].
+
+This project welcomes contributions and suggestions.  Most contributions require you to agree to a
+Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us
+the rights to use your contribution. For details, visit https://cla.microsoft.com.
+
+When you submit a pull request, a CLA-bot will automatically determine whether you need to provide
+a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions
+provided by the bot. You will only need to do this once across all repos using our CLA.
+
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
+For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or
+contact [[email protected]](mailto:[email protected]) with any additional questions or comments.
+
+### Additional Helpful Links for Contributors  
+Many people all over the world have helped make this project better.  You'll want to check out:
+
+* [What are some good first issues for new contributors to the repo?](https://github.com/azure/azure-sdk-for-go/issues?q=is%3Aopen+is%3Aissue+label%3A%22up+for+grabs%22)
+* [How to build and test your change][azure_sdk_for_go_contributing_developer_guide]
+* [How you can make a change happen!][azure_sdk_for_go_contributing_pull_requests]
+* Frequently Asked Questions (FAQ) and Conceptual Topics in the detailed [Azure SDK for Go wiki](https://github.com/azure/azure-sdk-for-go/wiki).
+
+<!-- ### Community-->
+### Reporting security issues and security bugs
+
+Security issues and bugs should be reported privately, via email, to the Microsoft Security Response Center (MSRC) <[email protected]>. You should receive a response within 24 hours. If for some reason you do not, please follow up via email to ensure we received your original message. Further information, including the MSRC PGP key, can be found in the [Security TechCenter](https://www.microsoft.com/msrc/faqs-report-an-issue).
+
+### License
+
+Azure SDK for Go is licensed under the [MIT](https://github.com/Azure/azure-sdk-for-go/blob/main/sdk/template/aztemplate/LICENSE.txt) license.
+
+<!-- LINKS -->
+[azure_sdk_for_go_contributing]: https://github.com/Azure/azure-sdk-for-go/blob/main/CONTRIBUTING.md
+[azure_sdk_for_go_contributing_developer_guide]: https://github.com/Azure/azure-sdk-for-go/blob/main/CONTRIBUTING.md#developer-guide
+[azure_sdk_for_go_contributing_pull_requests]: https://github.com/Azure/azure-sdk-for-go/blob/main/CONTRIBUTING.md#pull-requests
+[azure_cli]: https://docs.microsoft.com/cli/azure
+[azure_portal]: https://portal.azure.com
+[azure_sub]: https://azure.microsoft.com/free/
+[event_handler_storage_queues]: https://learn.microsoft.com/azure/event-grid/handler-storage-queues
+[event_handlers]: https://learn.microsoft.com/azure/event-grid/overview#event-handlers
+[product_docs]: https://learn.microsoft.com/azure/event-grid/overview
+[system_topics]: https://learn.microsoft.com/azure/event-grid/system-topics
+ [source]: https://azsdk/go/systemevents/src
+ [godoc_examples]: https://azsdk/go/systemevents/pkg#pkg-examples

sdk/messaging/eventgrid/azsystemevents/autorest.md

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+## Go
+
+``` yaml
+title: AzureEventGridSystemEvents
+description: Azure Event Grid system events
+generated-metadata: false
+clear-output-folder: false
+go: true
+require: https://github.com/Azure/azure-rest-api-specs/blob/11bbc2b1df2e915a2227a6a1a48a27b9e67c3311/specification/eventgrid/data-plane/readme.md
+license-header: MICROSOFT_MIT_NO_VERSION
+openapi-type: "data-plane"
+output-folder: ../azsystemevents
+override-client-name: ClientDeleteMe
+security: "AADToken"
+use: "@autorest/[email protected]"
+version: "^3.0.0"
+module: github.com/Azure/azure-sdk-for-go/sdk/messaging/eventgrid/azsystemevents
+slice-elements-byval: true
+remove-non-reference-schema: true
+batch:
+  - tag: package-2018-01
+directive:
+  - from: swagger-document
+    where: $
+    transform: $['paths'] = {}; return $;
+  - from: swagger-document
+    where: $.definitions.MediaJobOutput
+    transform: >
+      $.required.push("@odata.type");
+      $["x-csharp-usage"] = "model,output";
+  - from: swagger-document
+    where: $.definitions.CloudEventEvent
+    transform: $["x-ms-external"] = true
+  - from: 
+      - models.go
+      - models_serde.go
+    where: $
+    transform: |
+      return $.replace(/ResourceActionCancelData/g, 'ResourceActionCancelEventData')
+        .replace(/ResourceActionFailureData/g, 'ResourceActionFailureEventData')
+        .replace(/ResourceActionSuccessData/g, 'ResourceActionSuccessEventData')
+        .replace(/ResourceDeleteCancelData/g, 'ResourceDeleteCancelEventData')
+        .replace(/ResourceDeleteFailureData/g, 'ResourceDeleteFailureEventData')
+        .replace(/ResourceDeleteSuccessData/g, 'ResourceDeleteSuccessEventData')
+        .replace(/ResourceWriteCancelData/g, 'ResourceWriteCancelEventData')
+        .replace(/ResourceWriteFailureData/g, 'ResourceWriteFailureEventData')
+        .replace(/ResourceWriteSuccessData/g, 'ResourceWriteSuccessEventData')
+```
+
+```yaml
+directive:
+  - from:
+      - models.go
+      - responses.go
+      - options.go
+    where: $
+    transform: return $.replace(/CloudEventEvent/g, "CloudEvent");
+  - from: 
+      - models.go
+      - models_serde.go
+      - responses.go
+      - options.go
+    where: $
+    transform: return $.replace(/Schema of the Data property of an EventGridEvent/g, "Schema of the Data property of an CloudEvent/EventGridEvent");
+```
+
+```yaml
+directive:
+  - from: 
+    - models.go
+    - models_serde.go
+    where: $
+    transform: | 
+      return $
+        .replace(/ChannelLatencyMs \*string/g, "ChannelLatencyMS *string")
+        .replace(/m.ChannelLatencyMs/g, "m.ChannelLatencyMS");
+```
+
+```yaml
+directive:
+  - from: constants.go
+    where: $
+    transform: return $.replace(/EventGridMqttClientDisconnectionReason/g, "EventGridMQTTClientDisconnectionReason")
+  - from: models.go
+    where: $
+    transform: return $.replace(/DisconnectionReason \*EventGridMqttClientDisconnectionReason/, "DisconnectionReason *EventGridMQTTClientDisconnectionReason")
+```
+
+Manually map n/a to the zero value for the type for `MediaLiveEventChannelArchiveHeartbeatEventData` and `MediaLiveEventIngestHeartbeatEventData`
+
+```yaml
+directive:
+  - from: models_serde.go
+    where: $
+    transform: |
+      return $
+        .replace(/(\s+err = unpopulate\(val, "IngestDriftValue", &m.IngestDriftValue\))/, "$1\nfixNAValue(&m.IngestDriftValue)")
+        .replace(/(\s+err = unpopulate\(val, "ChannelLatencyMs", &m.ChannelLatencyMS\))/, "$1\nfixNAValue(&m.ChannelLatencyMS)");
+```
+
+Rename `AcsRouterWorkerSelector.TTLSeconds` to `TimeToLive`
+
+```yaml
+directive:
+  - from: 
+    - models.go
+    where: $
+    transform: return $.replace(/TTLSeconds \*float32/g, "TimeToLive *float32");
+  - from: 
+    - models_serde.go
+    where: $
+    transform: return $.replace(/a\.TTLSeconds/g, "a.TimeToLive");
+```
+
+Fix the EventGridEvent deserialization to work similar to CloudEvent.
+
+```yaml
+directive:
+  - from: models_serde.go
+    where: $
+    transform: |
+      return $.replace(/err = unpopulate\(val, "Data", &e.Data\)/, "e.Data = []byte(val)")
+```

sdk/messaging/eventgrid/azsystemevents/build.go

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+//go:build go1.18
+// +build go1.18
+
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License. See License.txt in the project root for license information.
+
+//go:generate autorest ./autorest.md
+//go:generate goimports -w ./..
+//go:generate go run ./internal/generate generate
+//go:generate goimports -w ./..
+
+package azsystemevents

sdk/messaging/eventgrid/azsystemevents/ci.yml

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+# NOTE: Please refer to https://aka.ms/azsdk/engsys/ci-yaml before editing this file.
+trigger:
+  branches:
+    include:
+      - main
+      - feature/*
+      - hotfix/*
+      - release/*
+  paths:
+    include:
+      - sdk/messaging/eventgrid/azsystemevents
+      - eng/
+
+pr:
+  branches:
+    include:
+      - main
+      - feature/*
+      - hotfix/*
+      - release/*
+  paths:
+    include:
+      - sdk/messaging/eventgrid/azsystemevents
+
+stages:
+  - template: /eng/pipelines/templates/jobs/archetype-sdk-client.yml
+    parameters:
+      ServiceDirectory: "messaging/eventgrid/azsystemevents"
+      RunLiveTests: true
+      UsePipelineProxy: false
+      Location: westus2
+      EnvVars:
+        AZURE_CLIENT_ID: $(AZSYSTEMEVENTS_CLIENT_ID)
+        AZURE_TENANT_ID: $(AZSYSTEMEVENTS_TENANT_ID)
+        AZURE_CLIENT_SECRET: $(AZSYSTEMEVENTS_CLIENT_SECRET)
+        AZURE_SUBSCRIPTION_ID: $(AZSYSTEMEVENTS_SUBSCRIPTION_ID)