Deployment settings file removed; debug-update and debug-preview flags added

3.251.0 (2026-07-08)

Bug Fixes

• [cli] Show a retain marker for retain-on-delete resources in --diff output #23754
• [cli] Don't miscopy out archives #23798

Miscellaneous

• [cli] Add pulumi neo --debug-update and pulumi neo --debug-preview flags to investigate a failed update or preview, suggested in the failure output #23499

Improvements

• [cli/convert] Add an ecosystem field to converter mapping requests so a converter can request mappings for the ecosystem it consumes rather than its own name #23804
• [cli/deployment] pulumi deployment settings no longer writes the local Pulumi.<stack>.deploy.yaml file: the experimental init, pull, configure, and env subcommands have been removed, and the CLI no longer calls the deployment-settings encrypt endpoint. get/edit/destroy continue to manage settings directly in Pulumi Cloud #23480
• [cli/deployment] The deployment settings file (Pulumi.<stack>.deploy.yaml) has been removed entirely. The experimental pulumi deployment settings push (update/up) command, the --config-file flag, and the SDK helpers that read the file have been removed. Manage deployment settings directly in Pulumi Cloud with pulumi deployment settings get, edit, and destroy #23480

Bug Fixes

• [cli/display] Prevent plugin debug logs from appearing as raw JSON in the CLI's output when logging with --logtostderr #23633

Improvements

• [cli/env] Report the new revision number when an environment definition is updated (e.g. pulumi env edit, pulumi env provider, pulumi env version rollback) #23799

Miscellaneous

• [cli/env] Fold the Pulumi ESC engine and CLI into the pulumi/pulumi monorepo, removing the sdk↔esc Go module cycle. Internal refactor with no user-facing behavior change; pulumi env/pulumi esc are unaffected. #23746

Improvements

• [cli/import] Support importing resources under parameterized providers from a converter or import file #23763
• [cli/import] Support importing resources under extension-parameterized providers #23779

Features

• [engine] Add TargetSnippets to deployment options to target snippets by UUID. #23745

Improvements

• [engine] Add OpenTelemetry spans to the StackReference read path so performance traces can pinpoint slow snapshot fetches, deserialization, or secret decryption #23787

Features

• [programgen/pcl] Invoke functions declared with multi-argument inputs using positional arguments in PCL #23571

Bug Fixes

• [sdk/nodejs] Don't include the version in module paths when serializing functions when using pnpm #23767

Features

• [sdkgen] Generate SDKs and programs for extension-parameterized packages #23579