- Fix an issue where running two copies of `pulumi plugin install` in parallel for the same plugin version could cause one to fail with an error about renaming a directory.
- If you're using Pulumi with Python, this release removes Python 2.7 support in favor of Python 3.6 and greater. In addition, some members have been renamed. For example the `stack_output` function has been renamed to `export`. All major features of Pulumi work with this release, including parallelism!
### Improvements
- Download plugins to a temporary folder during `pulumi plugin install` to ensure if the operation is canceled, the have downloaded plugin is not used.
- If an update is in progress when `pulumi stack ls` is run, don't show its last update time as "a long time ago".
- Add `--preserve-config` to `pulumi stack rm` which causes Pulumi to keep the `Pulumi.<stack-name>.yaml` when removing a stack.
- Support passing template names to `pulumi up` the same as `pulumi new` does.
- When `-g` or `--generate-only` is passed to `pulumi new`, don't show a confusing message that says it will update a stack.
- Fix an issue where an output property of a resource would change its type during an update in some cases.
- Provide richer detail on the properties during a multi-stage replace.
- Fix `pulumi logs` so it can collect log messages from Lambdas on AWS.
- Pulumi now reports metadata during CI runs on CircleCI, for later display on app.pulumi.com.
- Fix an assert that could fire if a checkpoint had multiple resources with the same URN (which could happen in cases where a delete operation was pending on an old copy of a resource).
- When `$TERM` is set to `dumb`, Pulumi should no longer try to use interactive reading from the terminal, which would fail.
- When displaying elapsed time for an update, round to the nearest second.
- Add the `--json` flag to the `pulumi logs` command.
- Add an `iterable` module to `@pulumi/pulumi` with two helpful combinators `toObject` and `groupBy` to help combine multiple `Output<T>`'s into a single object.
- Pulumi no longer prompts you for confirmation when `--skip-preview` is passed to `pulumi update`. Instead, it just preforms the update as requested.
- Add the `--json` flag to the `pulumi stack ls` command.
- The `--color=always` flag should now be respected in all cases.
- Pulumi now reports metadata about GitLab repositories when doing an update, so they can be shown on app.pulumi.com.
- Pulumi now uses compression when uploading your checkpoint file to the Pulumi service, which should speed up updates where your stack has many resources.
- "First Class" providers used to be shown as changing during previews. This is no longer the case.
