cloud: add cloud release notes for release-20260428

[doc-claw-bot]

What is changed, added, or deleted? (Required)

Add TiDB Cloud release notes for release-20260428 to tidb-cloud/releases/tidb-cloud-release-notes.md.

Which TiDB version(s) do your changes apply to? (Required)

• v8.5

What is the related PR or file link(s)?

None

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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[gemini-code-assist]

Code Review

This pull request adds release notes for April 28, 2026, detailing the public preview of TiDB Cloud Premium, the availability of TiProxy for TiDB Cloud Dedicated, firewall management enhancements, and the introduction of the TiDB Cloud Premium API. The review feedback suggests several improvements to align with the style guide, including the removal of unnecessary filler words, the use of consistent terminology and variables, proper formatting for UI elements, and adjustments to indentation and capitalization for improved clarity.

[gemini-code-assist]

According to the Repository Style Guide, you should avoid unnecessary words like "specifically" and "significantly". Also, the indentation of paragraphs should align with the start of the text in the parent list item (6 spaces for paragraphs under a 4-space indented list item).

Suggested change

	Powered by the [TiDB X](/tidb-cloud/tidb-x-architecture.md) kernel, TiDB Cloud Premium is specifically designed for mission-critical enterprise workloads that require hyperscale, uncompromising performance, and the cost efficiency of a cloud-native consumption model.
	TiDB Cloud Premium bridges the gap between TiDB Cloud Essential and TiDB Cloud Dedicated.
	- Compared with TiDB Cloud Essential, TiDB Cloud Premium delivers significantly stronger isolation across the compute, storage, and network layers, ensuring predictable performance for critical workloads. At the same time, it retains an elastic, on-demand scaling model, allowing compute capacity to scale independently without operational overhead.
	- Compared with TiDB Cloud Dedicated, TiDB Cloud Premium improves cost efficiency by eliminating idle headroom, so you only pay for the performance you actually use.
	Powered by the [TiDB X](/tidb-cloud/tidb-x-architecture.md) kernel, TiDB Cloud Premium is designed for mission-critical enterprise workloads that require hyperscale, uncompromising performance, and the cost efficiency of a cloud-native consumption model.
	TiDB Cloud Premium bridges the gap between TiDB Cloud Essential and TiDB Cloud Dedicated.
	- Compared with TiDB Cloud Essential, TiDB Cloud Premium delivers stronger isolation across the compute, storage, and network layers, ensuring predictable performance for critical workloads. At the same time, it retains an elastic, on-demand scaling model, allowing compute capacity to scale independently without operational overhead.
	- Compared with TiDB Cloud Dedicated, TiDB Cloud Premium improves cost efficiency by eliminating idle headroom, so you only pay for the performance you actually use.

References

1. Avoid unnecessary words and repetition. ^(link)

[gemini-code-assist]

According to the Repository Style Guide, UI options should be enclosed in backticks.

Suggested change

	To try TiDB Cloud Premium, go to the [TiDB Cloud console](https://tidbcloud.com/), click **Create Resource**, and select **Premium** as your plan. For more information, see [Create a TiDB Cloud Premium instance](/tidb-cloud/premium/create-tidb-instance-premium.md).
	To try TiDB Cloud Premium, go to the [TiDB Cloud console](https://tidbcloud.com/), click **Create Resource**, and select `Premium` as your plan. For more information, see [Create a TiDB Cloud Premium instance](/tidb-cloud/premium/create-tidb-instance-premium.md).

References

1. Code snippets, command names, options, and paths should be in backticks. ^(link)

[gemini-code-assist]

Use the variable {{{ .starter }}} for consistency with other parts of the documentation. Also, adjust the indentation of the paragraphs to align with the list item text (2 spaces).

Suggested change

	- Improve the firewall rule management experience for public endpoints of TiDB Cloud Starter and Essential.
	The TiDB Cloud console now provides a streamlined dialog for managing firewall rules for public endpoints in TiDB Cloud Starter and Essential. You can add your current IP address, allow access from all AWS IP addresses for AWS-hosted instances, or manually specify an IP address or IP address range in one place.
	For more information, see [Create and manage a firewall rule](/tidb-cloud/configure-serverless-firewall-rules-for-public-endpoints.md#create-and-manage-a-firewall-rule).
	- Improve the firewall rule management experience for public endpoints of {{{ .starter }}} and Essential instances.
	The TiDB Cloud console now provides a streamlined dialog for managing firewall rules for public endpoints in {{{ .starter }}} and Essential. You can add your current IP address, allow access from all AWS IP addresses for AWS-hosted instances, or manually specify an IP address or IP address range in one place.
	For more information, see [Create and manage a firewall rule](/tidb-cloud/configure-serverless-firewall-rules-for-public-endpoints.md#create-and-manage-a-firewall-rule).

References

1. Use consistent terminology. ^(link)

[gemini-code-assist]

Remove unnecessary filler words like "automatically and efficiently". Also, capitalize the descriptions in the list items for consistency with the rest of the document.

Suggested change

	- Introduce TiDB Cloud Premium API (v1beta2) for managing the following resources automatically and efficiently:
	- TiDB Cloud Premium Instance: manage the lifecycle and configuration of TiDB Cloud Premium instances, including passwords, CA certificates, and cloud provider information.
	- Backup: manage backups for TiDB Cloud Premium instances, including backup-based restore.
	- Region: retrieve available regions for creating TiDB Cloud Premium instances.
	- Introduce TiDB Cloud Premium API (v1beta2) for managing the following resources:
	- TiDB Cloud Premium instances: Manage the lifecycle and configuration of TiDB Cloud Premium instances, including passwords, CA certificates, and cloud provider information.
	- Backup: Manage backups for TiDB Cloud Premium instances, including backup-based restore.
	- Region: Retrieve available regions for creating TiDB Cloud Premium instances.

References

1. Avoid unnecessary words and repetition. ^(link)

[qiancai]

Close this PR as it is duplicated with #22814