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enable instrumentation telemetry #809

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enable instrumentation telemetry #809

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d853a87
enable instrumentation telemetry from non-periodic telemetrywriter th…
emmettbutler Apr 24, 2026
e797b0c
bool, not fn
emmettbutler Apr 24, 2026
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7 changes: 0 additions & 7 deletions datadog_lambda/config.py
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Original file line number Diff line number Diff line change
Expand Up @@ -152,10 +152,3 @@ def _reset(self):
# unset css aliases to ensure it is disabled
if "DD_TRACE_COMPUTE_STATS" in os.environ:
del os.environ["DD_TRACE_COMPUTE_STATS"]

if (
"DD_INSTRUMENTATION_TELEMETRY_ENABLED" not in os.environ
and not config.sca_enabled
and not config.appsec_enabled
):
os.environ["DD_INSTRUMENTATION_TELEMETRY_ENABLED"] = "false"
5 changes: 5 additions & 0 deletions datadog_lambda/tracing.py
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Expand Up @@ -31,6 +31,7 @@

from ddtrace import patch
from ddtrace import __version__ as ddtrace_version
from ddtrace.internal.telemetry import telemetry_writer
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@purple4reina purple4reina Apr 24, 2026

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I recall that importing the telemetry writer added a bunch of cold start time. Did you happen to check to see what impact it's had this time around?

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@emmettbutler emmettbutler Apr 27, 2026

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I haven't, though the impact is expected to be reduced by the changes from the RFC. Is there a benchmark somewhere in CI that you'd look at to validate this?

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@purple4reina purple4reina Apr 27, 2026

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It doesn't look like we have any on this repo, at least none that I can easily find. Is this the only change required to enable instrumentation telemetry? I can get a manual test going.

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@emmettbutler emmettbutler Apr 27, 2026

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Yes I believe it is

from ddtrace.propagation.http import HTTPPropagator
from ddtrace.trace import Context, Span, tracer

Expand Down Expand Up @@ -1509,6 +1510,10 @@ def create_function_execution_span(
pointer_hash=span_pointer_description.pointer_hash,
extra_attributes=span_pointer_description.extra_attributes,
)

if is_cold_start:
telemetry_writer.periodic(force_flush=True)

return span


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