Pulumi

- Fix error related to side-by-side versions of `pulumi/pulumi`.
[4235](https://github.com/pulumi/pulumi/pull/4235)

- Allow users to specify an alternate backend URL when using the GitHub Actions container with the env var `PULUMI_BACKEND_URL`.
[4243](https://github.com/pulumi/pulumi/pull/4243)

- Move to a multi-module repo to enable modules for the Go SDK
[4109](https://github.com/pulumi/pulumi/pull/4109)

- Report compile time errors for Go programs during plugin acquisition.
[4141](https://github.com/pulumi/pulumi/pull/4141)

- Add missing builtin `MapArray` to Go SDK.
[4144](https://github.com/pulumi/pulumi/pull/4144)

- Add aliases to Go SDK codegen pkg.
[4157](https://github.com/pulumi/pulumi/pull/4157)

- Discontinue testing on Node 8 (which has been end-of-life since January 2020), and start testing on Node 13.
[4156](https://github.com/pulumi/pulumi/pull/4156)

- Add support for enabling Policy Packs with configuration.
[3756](https://github.com/pulumi/pulumi/pull/4127)

- Remove obsolete .NET serialization attributes.
[4190](https://github.com/pulumi/pulumi/pull/4190)

- Add support for validating Policy Pack configuration.
[4179](https://github.com/pulumi/pulumi/pull/4186)

- Add support for plugin acquisition for Go programs
[4060](https://github.com/pulumi/pulumi/pull/4060)

- Display resource type in PAC violation output
[4061](https://github.com/pulumi/pulumi/issues/4061)

- Update to Helm v3 in pulumi Docker image
[4090](https://github.com/pulumi/pulumi/pull/4090)

- Add ArrayMap builtin types to Go SDK
[4086](https://github.com/pulumi/pulumi/pull/4086)

- Improve documentation of URL formats for `pulumi login`
[4059](https://github.com/pulumi/pulumi/pull/4059)

- Add support for stack transformations in the .NET SDK.
[4008](https://github.com/pulumi/pulumi/pull/4008)

- Fix `pulumi stack ls` on Windows
[4094](https://github.com/pulumi/pulumi/pull/4094)

- Add support for running Python policy packs.
[4057](https://github.com/pulumi/pulumi/pull/4057)

- Fix Kubernetes YAML parsing error in .NET.
[4023](https://github.com/pulumi/pulumi/pull/4023)

- Avoid projects beginning with `Pulumi` to stop cyclic imports
[4013](https://github.com/pulumi/pulumi/pull/4013)

- Ensure we can locate Go created application binaries on Windows
[4030](https://github.com/pulumi/pulumi/pull/4030)

- Ensure Python overlays work as part of our SDK generation
[4043](https://github.com/pulumi/pulumi/pull/4043)

- Fix terminal gets into a state where UP/DOWN don't work with prompts.
[4042](https://github.com/pulumi/pulumi/pull/4042)

- Ensure old provider is not used when configuration has changed
[4051](https://github.com/pulumi/pulumi/pull/4051)

- Support for unit testing and mocking in the .NET SDK.
[3696](https://github.com/pulumi/pulumi/pull/3696)

- Avoid Configuring providers which are not used during preview.
[4004](https://github.com/pulumi/pulumi/pull/4004)

- Fix missing module import on Windows platform.
[3983](https://github.com/pulumi/pulumi/pull/3983)

- Add support for mocking the resource monitor to the NodeJS and Python SDKs.
[3738](https://github.com/pulumi/pulumi/pull/3738)

- Reinstate caching of TypeScript compilation.
[4007](https://github.com/pulumi/pulumi/pull/4007)

- Remove the need to set PULUMI_EXPERIMENTAL to use the policy and watch commands.
[4001](https://github.com/pulumi/pulumi/pull/4001)

- Fix type annotations for `Output.all` and `Output.concat` in Python SDK.
[4016](https://github.com/pulumi/pulumi/pull/4016)

- Add support for configuring policies.
[4015](https://github.com/pulumi/pulumi/pull/4015)

- Fix a regression for CustomTimeouts in Python SDK.
[3964](https://github.com/pulumi/pulumi/pull/3964)

- Avoid panic when displaying failed stack policies.
[3960](https://github.com/pulumi/pulumi/pull/3960)

- Add support for secrets in the Go SDK.
[3938](https://github.com/pulumi/pulumi/pull/3938)

- Add support for transformations in the Go SDK.
[3978](https://github.com/pulumi/pulumi/pull/3938)