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Tilebox traces workflow jobs automatically. Job submission creates a root trace, task runners continue that trace across machines, and every task execution creates a span.
Job Execution Trace View
Built-in traces connect task order, dependencies, parallel execution, task duration, task status, runner identity, service identity, and logs emitted while a span was active.

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Add custom spans

Use context.tracer inside a task to add spans around meaningful parts of your own code. 
from tilebox.workflows import ExecutionContext, Task

class ProcessScene(Task):
    scene_id: str

    def execute(self, context: ExecutionContext) -> None:
        with context.tracer.span("download-scene") as span:
            span.set_attribute("scene_id", self.scene_id)
            # download input data

        with context.tracer.span("compute-index"):
            # perform expensive computation
            pass
Custom spans are nested under the current task span. Logs emitted inside the span are correlated with its trace_id and span_id.

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Span status and exceptions

If a task raises an exception, Tilebox records the exception on the task span and marks the span as failed before the task is retried or marked failed. For finer-grained error reporting, record errors on your custom spans before re-raising them. 
class ProcessScene(Task):
    scene_id: str

    def execute(self, context: ExecutionContext) -> None:
        with context.tracer.span("publish-output") as span:
            try:
                # publish output
                pass
            except Exception as error:
                span.record_exception(error)
                raise

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Query spans

You can retrieve spans for a job through the jobs client. Python results can also be converted to a pandas DataFrame. 
from tilebox.workflows import Client

client = Client()
job = client.jobs().submit("process-scene", ProcessScene(scene_id="S2A_001"))

spans = client.jobs().query_spans(job)
for span in spans:
    print(span.name, span.status_code, span.duration)

df = spans.to_pandas()
See Query telemetry for the log and span query APIs.

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Export to another backend

Tilebox stores traces by default. To export spans to your own observability backend as well, configure an OpenTelemetry or Axiom integration when the runner process starts.