copy over otel SDK compat stuff from the other otel PR

examples/experimental/otel/Makefile

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+POETRY:=poetry run
+PYTHON:=python
+PIP:=pip
+OTEL_AUTO:=opentelemetry-instrument
+TRULENS_PROVIDER:=trulens.experimental.otel_tracing.core.trace.TracerProvider
+
+# Configure OTEL with environment variables:
+# https://opentelemetry.io/docs/languages/sdk-configuration/general/
+run_with_otel_env:
+	OTEL_PYTHON_TRACER_PROVIDER=$(TRULENS_PROVIDER) \
+		OTEL_SERVICE_NAME=trulens_otel_test_env \
+		OTEL_TRACES_EXPORTER=zipkin \
+		OTEL_METRICS_EXPORTER=none \
+		$(POETRY) $(OTEL_AUTO) $(PYTHON) dummy.py
+
+# Configure OTEL with command line arguments:
+# https://opentelemetry.io/docs/zero-code/python/configuration/
+run_with_otel_cmd:
+	$(OTEL_AUTO) \
+		--tracer_provider $(TRULENS_PROVIDER) \
+		--service_name trulens_otel_test_cmd \
+		--traces_exporter zipkin \
+		--metrics_exporter none \
+		$(POETRY) $(PYTHON) dummy.py
+
+run_without_otel:
+	$(POETRY) $(PYTHON) dummy.py
+
+install:
+	$(POETRY) $(PIP) install -r requirements.txt
+
+# Start collector:
+start_collector:
+	docker run -p 4317:4317 \
+		-v otel-collector-config.yaml:/etc/otel-collector-config.yaml \
+		otel/opentelemetry-collector:latest \
+		--config=/etc/otel-collector-config.yaml
+
+# Start the zipkin docker container:
+start_zipkin:
+	docker run --rm -d -p 9411:9411 --name zipkin openzipkin/zipkin
+
+# Stop the zipkin docker container:
+stop_zipkin:
+	docker stop $(docker ps -a -q --filter ancestor=openzipkin/zipkin)

examples/experimental/otel/README.md

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+# OTEL Configuration
+
+This folder features examples of TruLens OTEL integration and how it interacts
+with OTEL command line tools.

examples/experimental/otel/dummy.py

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+# ruff: noqa: F401
+
+from pathlib import Path
+from pprint import pprint
+import sys
+
+import dotenv
+from opentelemetry import trace
+
+# zipkin exporter
+from opentelemetry.exporter.zipkin.json import ZipkinExporter
+
+# console exporter
+from trulens.apps.custom import TruCustomApp
+from trulens.core import Feedback
+from trulens.core import Select
+from trulens.core.session import TruSession
+from trulens.experimental.otel_tracing.core.trace import TracerProvider
+from trulens.feedback.dummy.provider import DummyProvider
+
+# Add base dir to path to be able to access test folder.
+base_dir = Path().cwd().parent.parent.parent.resolve()
+if str(base_dir) not in sys.path:
+    print(f"Adding {base_dir} to sys.path")
+    sys.path.append(str(base_dir))
+
+
+from examples.dev.dummy_app.app import DummyApp  # noqa: E402
+
+dotenv.load_dotenv()
+
+try:
+    print("Initial tracer_provider =", trace.get_tracer_provider())
+
+except Exception:  # pylint: disable=broad-except
+    print("No tracer provider set yet.")
+
+# Sets the global default tracer provider to be the trulens one.
+trace.set_tracer_provider(TracerProvider())
+
+print("Current tracer_provider =", trace.get_tracer_provider())
+
+# Creates a tracer for custom spans below.
+tracer = trace.get_tracer(__name__)
+
+# Setup zipkin exporter
+# exporter = ZipkinExporter(endpoint="http://localhost:9411/api/v2/spans")
+
+# Setup session with exporter.
+# session = TruSession(_experimental_otel_exporter=exporter)
+
+# If not using the exporter, manually enable the otel experimental feature:
+session = TruSession()
+session.experimental_enable_feature("otel_tracing")
+
+# Create dummy endpoint for a dummy feedback function:
+dummy_provider = DummyProvider()
+dummy_feedback = Feedback(dummy_provider.sentiment).on(
+    text=Select.RecordSpans.trulens.call.generate.attributes[
+        "trulens.bindings"
+    ].prompt
+)
+# Parts of the selector are:
+#
+# - Select.RecordSpans - Select spans dictionary, organized by span name.
+#
+# - trulens.call.generate - Span name. TruLens call spans are of the form
+#   "trulens.call.<method_name>".
+#
+# - attributes - Span attributes
+#
+# - ["trulens.bindings"] - Attributes specific to TruLens spans. Call spans include
+#   method call arguments in "trulens.bindings".
+#
+# - prompt - The prompt argument to the method call named.
+
+# Create custom app:
+ca = DummyApp()
+
+# Create trulens wrapper:
+ta = TruCustomApp(
+    ca,
+    app_id="customapp",
+    feedbacks=[dummy_feedback],
+)
+
+# Normal trulens recording context manager:
+with ta as recorder:
+    # Another custom span.
+    with tracer.start_as_current_span("custom inner span") as inner_span:
+        inner_span.set_attribute("custom", "value")
+
+        # Normal instrumented call:
+        print(ca.respond_to_query("hello"))
+
+record = recorder.get()
+
+# Check the feedback results. Note that this feedback function is from a dummy
+# provider which does not have true sentiment analysis.
+
+pprint(record.feedback_results[0].result())
+
+# Check trulens instrumented calls as spans:
+
+pprint(record.get(Select.RecordSpans))

examples/experimental/otel/otel-collector-config.yaml

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+# OTEL SDK Configuration for testing TruLens OTEL integration.
+
+# https://opentelemetry.io/docs/languages/python/getting-started/
+
+receivers:
+  otlp:
+    protocols:
+      grpc:
+        endpoint: 0.0.0.0:4317
+      http:
+        endpoint: 0.0.0.0:4318
+exporters:
+  # NOTE: Prior to v0.86.0 use `logging` instead of `debug`.
+  debug:
+    verbosity: detailed
+processors:
+  batch:
+service:
+  pipelines:
+    traces:
+      receivers: [otlp]
+      exporters: [debug]
+      processors: [batch]

examples/experimental/otel/requirements.txt

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+# python deps, OTEL:
+opentelemetry-api
+opentelemetry-sdk
+opentelemetry-exporter-otlp
+
+# OTEL contrib instrumentors
+opentelemetry-instrumentation-sqlalchemy
+opentelemetry-instrumentation-requests
+
+# Traceloop instrumentors
+opentelemetry-instrumentation-llamaindex
+opentelemetry-instrumentation-openai
+
+# Arize openinference instrumentors
+openinference-instrumentation-llama-index >= 2
+
+# OTEL zipkin exporter
+opentelemetry-exporter-zipkin-proto-http