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Backstage 1.55 Adds Scaffolder Task Recovery and Removes Deprecated Catalog APIs

Backstage 1.55.0 can resume crashed or timed-out Scaffolder tasks, but recovery requires idempotent actions and a registered workspace provider. The release also removes Catalog compatibility APIs, deprecated processor exports and stitching configuration.
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Backstage 1.55.0 introduces automatic recovery for Scaffolder tasks that crash or time out, while removing several deprecated Catalog compatibility APIs and settings. Upgrading safely requires Catalog code changes, a registered workspace-serialization provider, and an idempotency review for every Scaffolder action if recovery is enabled.

What changed in Backstage 1.55

The release combines two significant upgrade areas: a breaking cleanup in the Catalog backend and a new recovery model for Scaffolder workers. Recovery is disabled unless you configure it, and the old experimental recovery settings remain available as fallbacks during migration.

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Catalog APIs and configuration removed

Relations now use targetRef

Backstage 1.55.0 removes catalog.enableRelationsCompatibility and its compatibility layer. Entity relations are returned in the standard format with a targetRef value. Integrations, processors or frontend code that still read the old target field must be updated to consume targetRef.

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Deprecated processors moved out of core exports

The deprecated CodeOwnersProcessor and AnnotateScmSlugEntityProcessor exports are no longer available from the former locations. Replace them with the maintained community backend modules:

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  • @backstage-community/plugin-catalog-backend-module-codeowners
  • @backstage-community/plugin-catalog-backend-module-annotate-scm-slug

Install each module your catalog still needs and register it in the backend using the module’s current integration instructions. Leaving an old import in place will cause the backend build or startup to fail.

Stitching strategy setting removed

Delete the deprecated catalog.stitchingStrategy.mode configuration. Keeping obsolete compatibility keys in configuration can make an upgrade appear partially successful while the intended behavior is no longer being selected.

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How Scaffolder task recovery works

The new scaffolder.taskRecovery configuration enables automatic recovery for tasks that crash or time out. A recovered task resumes from its last completed step rather than starting over. Completed step outputs are persisted, and task secrets are retained until the task reaches a terminal state so the recovery attempt can continue.

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Recovery applies to every Scaffolder task once enabled. Actions therefore need to be safe when invoked again. Make external operations idempotent—for example, use an existing resource’s stable identifier instead of blindly creating a duplicate—or add checkpoints that let an action detect work already completed.

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Crash or timeout Automatically resumes from the last completed step A retry reruns every step
Secrets Retained until terminal state Cleared as soon as the task is claimed
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Action requirement Actions should be idempotent or checkpointed Actions still need normal retry safety, but no automatic resume is performed

Configuration migration from experimental flags

The new section consolidates three earlier settings: EXPERIMENTAL_recoverTasks, EXPERIMENTAL_workspaceSerialization and EXPERIMENTAL_recoverTasksTimeout. Those flags remain supported as fallbacks, so an existing installation can continue operating while you move to the scaffolder.taskRecovery configuration. They do not, however, change the default: recovery remains off until explicitly configured.

Before switching it on, inventory custom actions that create repositories, tickets, cloud resources, database records or other externally visible effects. Verify that a retry can recognize an already completed operation, or store a checkpoint before proceeding to the next irreversible step.

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Workspace serialization requires a provider

Task recovery depends on serialized workspaces. Backstage 1.55 requires a separately installed and registered workspace provider; merely adding a provider name to configuration is not enough. The Scaffolder rejects a configured provider that has not been installed and registered.

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Development option: database provider

For development environments, Backstage documents @backstage/plugin-scaffolder-backend-module-workspace-database. It has a 50 MB workspace limit and is not recommended for production. On its first startup, it migrates existing database workspace snapshots from the legacy task storage.

Production option: external storage

Production deployments should use an external provider such as @backstage/plugin-scaffolder-backend-module-gcp, or another provider suited to your storage, retention and availability requirements. Install the module, register its backend provider, then reference that registered provider in the Scaffolder configuration before enabling recovery.

Other upgrade action: move Sentry configuration

If a custom action currently sets a Sentry apiBaseUrl, move that value to scaffolder.sentry.apiBaseUrl. Keeping the setting at the action level can leave error reporting misconfigured after the upgrade.

Worker reliability improvements

The 1.55 changelog also describes resilience fixes in the Scaffolder worker:

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  • Repeated database claim failures now back off instead of hammering the database.
  • Unexpected execution errors are contained rather than taking down the worker loop.
  • Graceful shutdown stops new task claims so in-flight work can finish cleanly.
  • A transient task-pickup error is retried instead of silently halting task processing.

Previously, a pickup failure could leave new tasks queued with no visible error or failing health check until an operator restarted the worker. These changes reduce that failure mode, but normal queue, database and provider monitoring is still necessary.

Upgrade checklist

  1. Search catalog integrations and UI code for relation reads using target; change them to targetRef.
  2. Remove catalog.enableRelationsCompatibility and catalog.stitchingStrategy.mode from configuration.
  3. Replace removed processor imports with the corresponding community modules, then install and register those modules.
  4. Move custom Sentry action endpoints to scaffolder.sentry.apiBaseUrl.
  5. Choose a workspace provider. Use the database module only for development and account for its 50 MB limit; select external storage for production.
  6. Install and register the provider before referencing it in Scaffolder configuration.
  7. Replace experimental recovery settings with scaffolder.taskRecovery when ready; keep the fallbacks only as a temporary migration bridge.
  8. Test representative failures and timeouts in a non-production environment. Confirm that a recovered task resumes at the expected step, preserves required secrets, and does not duplicate external side effects.
  9. During rollout, watch task pickup, queue depth, database errors and provider capacity so operational problems are visible even with the new worker safeguards.

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