Cover OTLP export status in startup logs [dotnet@brian.marks/otlp-export-startup-log][nodejs@brian.marks/otlp-export-startup-log][python@brian.marks/otlp-export-startup-log][ruby@brian.marks/otlp-export-startup-log]

manifests/dotnet.yml

@@ -1049,6 +1049,10 @@ manifest:
       component_version: <3.36.0
   ? tests/parametric/test_span_sampling.py::Test_Span_Sampling::test_root_span_selected_and_child_dropped_by_sss_when_dropping_policy_is_active016
   : missing_feature (The .NET tracer sends the full trace to the agent anyways.)
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_export_fields: v3.50.0
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_logs_export_enabled: v3.50.0
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_metrics_export_enabled: v3.50.0
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_traces_export_enabled: v3.50.0
   tests/parametric/test_telemetry.py::Test_Consistent_Configs: missing_feature
   tests/parametric/test_telemetry.py::Test_Defaults: v2.49.0
   tests/parametric/test_telemetry.py::Test_Defaults::test_library_settings:

manifests/golang.yml

@@ -1510,6 +1510,10 @@ manifest:
   tests/parametric/test_span_sampling.py::Test_Span_Sampling::test_single_rule_with_head_and_rule_trace_sampling_keep_019:  # Modified by easy win activation script
     - declaration: bug (APMAPI-1545)
       component_version: <2.5.0
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_export_fields: v2.11.0-dev
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_logs_export_enabled: v2.11.0-dev
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_metrics_export_enabled: v2.11.0-dev
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_traces_export_enabled: v2.11.0-dev
   tests/parametric/test_telemetry.py::Test_Consistent_Configs: missing_feature (APMAPI-745)
   tests/parametric/test_telemetry.py::Test_Defaults: missing_feature
   tests/parametric/test_telemetry.py::Test_Environment: missing_feature

manifests/java.yml

@@ -3974,6 +3974,10 @@ manifest:
   tests/parametric/test_span_sampling.py::Test_Span_Sampling::test_single_rule_with_head_and_rule_trace_sampling_drop_020:
     - component_version: ">=1.57.0"
       declaration: flaky (APMAPI-1785)
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_export_fields: v1.65.0-SNAPSHOT
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_logs_export_enabled: v1.65.0-SNAPSHOT
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_metrics_export_enabled: v1.65.0-SNAPSHOT
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_traces_export_enabled: v1.65.0-SNAPSHOT
   tests/parametric/test_telemetry.py::Test_Consistent_Configs: missing_feature
   tests/parametric/test_telemetry.py::Test_Defaults: v1.61.0-SNAPSHOT  # Normalization of telemetry keys updated in https://github.com/DataDog/dd-trace-java/pull/10823
   tests/parametric/test_telemetry.py::Test_Environment: v1.61.0-SNAPSHOT  # Normalization of telemetry keys updated in https://github.com/DataDog/dd-trace-java/pull/10823

manifests/nodejs.yml

@@ -102,6 +102,7 @@ refs:
   - &ref_5_111_0 '>=5.111.0'
   - &ref_6_0_0 '>=6.0.0-pre'
   - &ref_6_5_0 '>=6.5.0 || ^5.116.0'
+  - &ref_7_0_0 '>=7.0.0-pre'
 manifest:
   tests/ai_guard/test_ai_guard_sdk.py::Test_AIGuardEvent_Tag:
     - weblog_declaration:
@@ -2250,6 +2251,10 @@ manifest:
   : missing_feature (Not implemented)
   tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_default: *ref_6_0_0
   tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_diagnostic_agent_unreachable: missing_feature (Diagnostic messages not emitted when agent is unreachable)
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_export_fields: *ref_7_0_0
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_logs_export_enabled: *ref_7_0_0
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_metrics_export_enabled: *ref_7_0_0
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_traces_export_enabled: *ref_7_0_0
   tests/parametric/test_telemetry.py::Test_Consistent_Configs: *ref_5_25_0
   tests/parametric/test_telemetry.py::Test_Consistent_Configs::test_library_settings_2: missing_feature (Not implemented)
   tests/parametric/test_telemetry.py::Test_Defaults: *ref_5_6_0

manifests/php.yml

@@ -1087,6 +1087,10 @@ manifest:
   tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_default: incomplete_test_app (Not currently testable)
   tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_diagnostic_agent_unreachable: missing_feature (Diagnostic messages not emitted when agent is unreachable)
   tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_enabled: incomplete_test_app (Not currently testable)
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_export_fields: incomplete_test_app (Not currently testable)
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_logs_export_enabled: incomplete_test_app (Not currently testable)
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_metrics_export_enabled: incomplete_test_app (Not currently testable)
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_traces_export_enabled: incomplete_test_app (Not currently testable)
   tests/parametric/test_telemetry.py::Test_Consistent_Configs: missing_feature
   tests/parametric/test_telemetry.py::Test_Defaults: missing_feature
   tests/parametric/test_telemetry.py::Test_Environment: missing_feature

manifests/python.yml

@@ -2044,6 +2044,10 @@ manifest:
   tests/parametric/test_span_sampling.py::Test_Span_Sampling::test_single_rule_with_head_and_rule_trace_sampling_keep_019:  # Modified by easy win activation script
     - declaration: bug (APMAPI-1545)
       component_version: <4.3.1
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_export_fields: v4.13.0.dev
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_logs_export_enabled: v4.13.0.dev
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_metrics_export_enabled: v4.13.0.dev
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_traces_export_enabled: v4.13.0.dev
   tests/parametric/test_telemetry.py::Test_Consistent_Configs: missing_feature
   tests/parametric/test_telemetry.py::Test_Consistent_Configs::test_library_settings:
     - declaration: missing_feature (Reports configurations with unexpected names)

manifests/ruby.yml

@@ -2442,6 +2442,10 @@ manifest:
     - declaration: bug (APMAPI-1545)
       component_version: <2.20.0
   tests/parametric/test_span_sampling.py::Test_Span_Sampling::test_special_glob_characters_span_sampling_sss002: "missing_feature (\"Issue: _dd.span_sampling.max_per_second is always set in Ruby\")"
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_export_fields: v2.40.0.dev
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_logs_export_enabled: v2.40.0.dev
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_metrics_export_enabled: v2.40.0.dev
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_traces_export_enabled: irrelevant (Ruby exports spans in Datadog native format and has no OTLP trace exporter)
   tests/parametric/test_telemetry.py::Test_Consistent_Configs: missing_feature
   tests/parametric/test_telemetry.py::Test_Defaults: missing_feature
   tests/parametric/test_telemetry.py::Test_Environment: missing_feature

manifests/rust.yml

@@ -317,6 +317,10 @@ manifest:
   tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_default: missing_feature (Startup logs not implemented)
   tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_diagnostic_agent_unreachable: missing_feature (Diagnostic messages not implemented)
   tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_enabled: missing_feature (Startup logs not implemented)
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_export_fields: missing_feature (Startup logs not implemented)
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_logs_export_enabled: missing_feature (Startup logs not implemented)
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_metrics_export_enabled: missing_feature (Startup logs not implemented)
+  tests/parametric/test_startup_logs.py::Test_Startup_Logs::test_startup_logs_otlp_traces_export_enabled: missing_feature (Startup logs not implemented)
   tests/parametric/test_telemetry.py::Test_Consistent_Configs: missing_feature
   tests/parametric/test_telemetry.py::Test_Defaults: missing_feature
   tests/parametric/test_telemetry.py::Test_Environment: missing_feature

tests/parametric/test_startup_logs.py

@@ -1,6 +1,8 @@
 """Test startup log behavior for tracer libraries across supported languages."""
 
+import contextlib
 import re
+import time
 
 import pytest
 
@@ -12,6 +14,59 @@
 # Regex pattern for matching startup log entries across all tracer libraries
 STARTUP_LOG_PATTERN = r"DATADOG (TRACER )?CONFIGURATION( - (CORE|TRACING|PROFILING|.*))?"
 
+# Defense-in-depth caps for the container stderr read in _get_startup_logs: whichever limit is
+# hit first stops the read, so an unbounded stream can't hang the suite. All are far above any
+# real tracer's startup output, so they never truncate logs in normal operation.
+_STARTUP_LOG_MAX_LINES = 50_000
+_STARTUP_LOG_MAX_BYTES = 10 * 1024 * 1024  # 10 MiB
+_STARTUP_LOG_MAX_SECONDS = 30.0
+
+# Boolean fields every tracer publishes in its startup diagnostic configuration describing
+# whether traces/metrics/logs are exported over OTLP.
+OTLP_EXPORT_FIELDS = (
+    "otlp_traces_export_enabled",
+    "otlp_metrics_export_enabled",
+    "otlp_logs_export_enabled",
+)
+
+
+def _extract_otlp_export_fields(logs: str) -> dict[str, bool]:
+    """Extract the three OTLP-export booleans from the tracer startup configuration line.
+
+    The startup diagnostic is NOT serialized uniformly across tracers:
+      - JSON, " - " marker separator: Node.js ("DATADOG TRACER CONFIGURATION - {json}"),
+        .NET ("DATADOG TRACER CONFIGURATION - {json}"), Ruby ("DATADOG CONFIGURATION - CORE - {json}").
+      - JSON, no " - " separator: Go ("DATADOG TRACER CONFIGURATION {json}"),
+        Java (SLF4J "DATADOG TRACER CONFIGURATION {json}").
+      - Python dict repr, NOT JSON: "- DATADOG TRACER CONFIGURATION - {dict}" produced by
+        "%s" % dict, so single-quoted keys and True/False/None -- json.loads would fail on it.
+
+    Rather than depend on a single per-language marker or full-object decoding (Python's payload
+    is not valid JSON, and the JSON payloads embed nested objects that make a naive brace match
+    fragile), the config line is located by field name and each boolean is read directly with a
+    quote-style- and casing-tolerant regex. An UNQUOTED true/false/True/False is required, so a
+    string-encoded value such as "true" would not match -- this preserves the guarantee that each
+    field is emitted as a real boolean.
+    """
+    config_line = None
+    for line in logs.splitlines():
+        if OTLP_EXPORT_FIELDS[0] in line:
+            config_line = line
+            break
+    assert config_line is not None, (
+        f"No tracer startup configuration line containing '{OTLP_EXPORT_FIELDS[0]}' found. "
+        f"Logs (first 2000 chars): {logs[:2000]}"
+    )
+
+    fields: dict[str, bool] = {}
+    for name in OTLP_EXPORT_FIELDS:
+        match = re.search(rf"""["']?{name}["']?\s*:\s*(true|false|True|False)\b""", config_line)
+        assert match, (
+            f"Field '{name}' not present as a boolean in the startup configuration line. Config line: {config_line}"
+        )
+        fields[name] = match.group(1).lower() == "true"
+    return fields
+
 
 def _get_dotnet_startup_logs(test_library: APMLibrary, *, required: bool = True) -> str | None:
     """Get .NET tracer startup logs from the container (dotnet-tracer-managed* file).
@@ -51,15 +106,58 @@ def _get_startup_logs(test_library: APMLibrary, *, required: bool = True) -> str
     """
     if context.library == "dotnet":
         return _get_dotnet_startup_logs(test_library, required=required)
-    else:
-        try:
-            logs = test_library.container.logs(stderr=True, stdout=False).decode("utf-8")
-        except Exception as e:
-            if required:
-                pytest.fail(f"Failed to retrieve container logs: {e}")
-            return None
 
-    return logs
+    # Bound the stderr read so a misbehaving tracer emitting an unbounded stream (e.g. a logging
+    # feedback loop) can't hang the suite -- a one-shot container.logs() read would chase that
+    # moving target forever. Stream the current snapshot (follow=False self-terminates at its end)
+    # and stop at the first of the line/byte/time caps.
+    #
+    # Read the whole bounded snapshot rather than stopping at the first startup-config marker:
+    # some tracers emit asserted-on content after it (Ruby logs "CONFIGURATION - CORE" at init,
+    # then "CONFIGURATION - TRACING" and its "Agent Error" line only after a flush). Startup logs
+    # are early, so the caps never truncate them in normal runs.
+    log_stream = None
+    truncated = False
+    buffer = bytearray()
+    line_count = 0
+    try:
+        # stream=True yields raw byte chunks (docker log frames), not lines; a line may span
+        # chunks, so we accumulate bytes and decode once at the end.
+        log_stream = test_library.container.logs(stream=True, stdout=False, stderr=True, follow=False)
+
+        deadline = time.monotonic() + _STARTUP_LOG_MAX_SECONDS
+        for chunk in log_stream:
+            if not chunk:
+                continue
+            buffer += chunk
+            line_count += chunk.count(b"\n")
+            if (
+                line_count >= _STARTUP_LOG_MAX_LINES
+                or len(buffer) >= _STARTUP_LOG_MAX_BYTES
+                or time.monotonic() >= deadline
+            ):
+                truncated = True
+                break
+    except Exception as e:
+        if required:
+            pytest.fail(f"Failed to retrieve container logs: {e}")
+        return None
+    finally:
+        # Release the streaming socket promptly; we may have stopped mid-snapshot at a cap.
+        if log_stream is not None:
+            with contextlib.suppress(Exception):
+                log_stream.close()
+
+    if truncated:
+        # Never truncate silently: a cap only trips if a tracer is emitting an abnormally large
+        # (likely runaway) stderr stream, which is worth surfacing in CI output.
+        logger.warning(
+            f"Startup-log read hit a safety cap and was truncated at {line_count} lines / "
+            f"{len(buffer)} bytes; a tracer may be emitting an unbounded stderr stream."
+        )
+
+    # errors="replace" guards against a multi-byte character truncated at a cap boundary.
+    return buffer.decode("utf-8", errors="replace")
 
 
 @scenarios.parametric
@@ -96,6 +194,85 @@ def test_startup_logs_enabled(self, test_library: APMLibrary):
                 f"Content (first 2000 chars): {logs[:2000]}"
             )
 
+    @parametrize(
+        "library_env",
+        [{"DD_TRACE_STARTUP_LOGS": "true"}],
+    )
+    def test_startup_logs_otlp_export_fields(self, test_library: APMLibrary):
+        """Verify the OTLP-export booleans are present, are booleans, and default to false.
+
+        No OTLP-related environment variables are set, so every implementing tracer must report
+        all three fields as False. DD_TRACE_STARTUP_LOGS=true only guarantees the diagnostic is
+        emitted; it does not affect the OTLP-export values. Uniform across implementing languages.
+        """
+        with test_library:
+            logs = _get_startup_logs(test_library, required=True)
+
+            assert logs is not None
+            fields = _extract_otlp_export_fields(logs)
+            for name in OTLP_EXPORT_FIELDS:
+                assert fields[name] is False, (
+                    f"Expected {name} to default to False (no OTLP env vars set), got {fields[name]!r}"
+                )
+
+    @parametrize(
+        "library_env",
+        [{"DD_TRACE_STARTUP_LOGS": "true", "OTEL_TRACES_EXPORTER": "otlp"}],
+    )
+    def test_startup_logs_otlp_traces_export_enabled(self, test_library: APMLibrary):
+        """Verify otlp_traces_export_enabled is true when OTEL_TRACES_EXPORTER=otlp.
+
+        Gated (via manifests) to the tracers that support OTLP trace export. Ruby and PHP do not
+        support it, so they are marked irrelevant/incomplete rather than skipped in the body.
+        """
+        with test_library:
+            logs = _get_startup_logs(test_library, required=True)
+
+            assert logs is not None
+            fields = _extract_otlp_export_fields(logs)
+            assert fields["otlp_traces_export_enabled"] is True, (
+                f"Expected otlp_traces_export_enabled to be True with OTEL_TRACES_EXPORTER=otlp, "
+                f"got {fields['otlp_traces_export_enabled']!r}"
+            )
+
+    @parametrize(
+        "library_env",
+        [
+            {
+                "DD_TRACE_STARTUP_LOGS": "true",
+                "DD_METRICS_OTEL_ENABLED": "true",
+                "DD_RUNTIME_METRICS_ENABLED": "true",  # .NET only flips OTLP metrics when runtime metrics are on
+            }
+        ],
+    )
+    def test_startup_logs_otlp_metrics_export_enabled(self, test_library: APMLibrary):
+        """Verify otlp_metrics_export_enabled is true when DD_METRICS_OTEL_ENABLED=true."""
+        with test_library:
+            logs = _get_startup_logs(test_library, required=True)
+
+            assert logs is not None
+            fields = _extract_otlp_export_fields(logs)
+            assert fields["otlp_metrics_export_enabled"] is True, (
+                f"Expected otlp_metrics_export_enabled to be True with DD_METRICS_OTEL_ENABLED=true, "
+                f"got {fields['otlp_metrics_export_enabled']!r}"
+            )
+
+    @parametrize(
+        "library_env",
+        [{"DD_TRACE_STARTUP_LOGS": "true", "DD_LOGS_OTEL_ENABLED": "true"}],
+    )
+    def test_startup_logs_otlp_logs_export_enabled(self, test_library: APMLibrary):
+        """Verify otlp_logs_export_enabled is true when DD_LOGS_OTEL_ENABLED=true."""
+        with test_library:
+            logs = _get_startup_logs(test_library, required=True)
+
+            assert logs is not None
+            fields = _extract_otlp_export_fields(logs)
+            assert fields["otlp_logs_export_enabled"] is True, (
+                f"Expected otlp_logs_export_enabled to be True with DD_LOGS_OTEL_ENABLED=true, "
+                f"got {fields['otlp_logs_export_enabled']!r}"
+            )
+
     @parametrize(
         "library_env",
         [