datasette/docs/telemetry_doc.py
Alex Garcia 6916287503 Review polish: drop unused prefix machinery, tighten comments and docs
- Remove the registry's unused prefix=True slot, its span_for() branch,
  its doc-rendering case and its test - nothing in the stack sets it.
- Stop promising a "later phase" query-duration metric dimension in the
  db.operation.name description; the cardinality rationale stands alone.
- Replace baked-in benchmark numbers in the telemetry module docstring
  with the docs' own phrasing (below run-to-run variation).
- Compact the duplicated copy_context() and enqueue-site comments in
  database.py to pointers at their canonical tellings.
- Make the "catch people out" gotchas skimmable as a bullet list and
  give the changelog's "nothing is removed" line a clear antecedent.
- Add a test that a result cut short by max_returned_rows records
  datasette.truncated=True - previously only ever asserted False.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012U7coQfVu8nK2R4q2mCULA
2026-09-02 11:25:10 -07:00

36 lines
1.2 KiB
Python

"""
Render the span reference in ``internals.rst`` from
``datasette/telemetry_registry.py``.
Driven by cog, and ``cog --check docs/*.rst`` runs in CI - so adding a span
without documenting it, or documenting one that no longer exists, is a build
failure rather than something a reader discovers later.
"""
def _attribute_lines(cog, attributes):
if not attributes:
cog.out(" No attributes.\n\n")
return
cog.out(" Attributes:\n\n")
for attribute in attributes:
suffix = " *(optional)*" if attribute.optional else ""
cog.out(f" - ``{attribute}``{suffix} - {attribute.description}\n")
cog.out("\n")
def spans(cog):
from opentelemetry.trace import SpanKind
from datasette.telemetry_registry import SPANS
cog.out("\n")
for span in SPANS:
cog.out(f"``{span}``\n")
cog.out(f" {span.description}\n\n")
# INTERNAL is the default and the overwhelming majority of spans -
# printing it on every one would be noise. Only the exceptional case,
# a real database call, is worth calling out.
if span.kind != SpanKind.INTERNAL:
cog.out(f" Kind: ``{span.kind.name}``.\n\n")
_attribute_lines(cog, span.attributes)