How are step errors logged?

how are step errors logged? i mean if i want to search for a step that failed in my logs

Now I have a complete picture. Here's how step errors are logged in Vercel Workflow:

##How Step Errors Are Logged

When a step fails, the workflow system logs errors in multiple ways:

###1. Console Logs (Runtime Logs)

Step errors are logged to the console with a specific format. You can search for these patterns in your logs:

For Fatal Errors:

[Workflows] "{workflowRunId}" - Encountered `FatalError` while executing step "{stepName}":
  > {stack trace lines}

Bubbling up error to parent workflow

For Regular Errors (max retries reached):

[Workflows] "{workflowRunId}" - Encountered `Error` while executing step "{stepName}" (attempt {n}, {retries} retries):
  > {stack trace lines}

  Max retries reached
  Bubbling error to parent workflow

For Retryable Errors (still has retries left):

[Workflows] "{workflowRunId}" - Encountered `RetryableError` while executing step "{stepName}" (attempt {n}):
  > {error message}

  This step has failed but will be retried

###2. Event Log (step_failed event)

Each step failure creates a step_failed event that is stored in the world's event log with:

• correlationId: the step ID
• eventData.error: the error message
• eventData.stack: the stack trace
• eventData.fatal: true if it was a fatal error or max retries reached

###3. OpenTelemetry Attributes

If you have tracing enabled, step failures include these span attributes:

• step.error.name - Name of the error class
• step.error.message - The error message
• step.fatal_error - Boolean indicating if it's fatal
• step.retry.exhausted - Boolean indicating if all retries were used
• step.status - Set to "failed"

###Searching Your Logs

To find failed steps in your logs, you can search for:

The source for this is in packages/core/src/runtime/step-handler.ts (lines ~307-410).