Rename env vars from OTEL_TRACE -> OTEL_TRACES

CHANGELOG.md

@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 - Tracer and Meter provider environment variables are now consistent with the rest
   ([#1571](https://github.com/open-telemetry/opentelemetry-python/pull/1571)])
+- Rename `TRACE_` to `TRACES_` for environment variables
+  ([#1595](https://github.com/open-telemetry/opentelemetry-python/pull/1595)])
 
 ### Added
 - Added `end_on_exit` argument to `start_as_current_span`

opentelemetry-api/src/opentelemetry/environment_variables/__init__.py

@@ -17,5 +17,5 @@
 OTEL_PYTHON_DISABLED_INSTRUMENTATIONS = "OTEL_PYTHON_DISABLED_INSTRUMENTATIONS"
 OTEL_PYTHON_IDS_GENERATOR = "OTEL_PYTHON_IDS_GENERATOR"
 OTEL_PYTHON_SERVICE_NAME = "OTEL_PYTHON_SERVICE_NAME"
-OTEL_TRACE_EXPORTER = "OTEL_TRACE_EXPORTER"
+OTEL_TRACES_EXPORTER = "OTEL_TRACES_EXPORTER"
 OTEL_PYTHON_TRACER_PROVIDER = "OTEL_PYTHON_TRACER_PROVIDER"

opentelemetry-distro/src/opentelemetry/distro/__init__.py

@@ -23,7 +23,7 @@
 from opentelemetry.environment_variables import (
     OTEL_PYTHON_IDS_GENERATOR,
     OTEL_PYTHON_SERVICE_NAME,
-    OTEL_TRACE_EXPORTER,
+    OTEL_TRACES_EXPORTER,
 )
 from opentelemetry.instrumentation.configurator import BaseConfigurator
 from opentelemetry.instrumentation.distro import BaseDistro
@@ -54,7 +54,7 @@ def _get_service_name() -> str:
 
 
 def _get_exporter_names() -> Sequence[str]:
-    trace_exporters = environ.get(OTEL_TRACE_EXPORTER)
+    trace_exporters = environ.get(OTEL_TRACES_EXPORTER)
 
     exporters = set()
 
@@ -175,4 +175,4 @@ class OpenTelemetryDistro(BaseDistro):
     """
 
     def _configure(self, **kwargs):
-        os.environ.setdefault(OTEL_TRACE_EXPORTER, "otlp_span")
+        os.environ.setdefault(OTEL_TRACES_EXPORTER, "otlp_span")

opentelemetry-distro/tests/test_distro.py

@@ -19,7 +19,7 @@
 from pkg_resources import DistributionNotFound, require
 
 from opentelemetry.distro import OpenTelemetryDistro
-from opentelemetry.environment_variables import OTEL_TRACE_EXPORTER
+from opentelemetry.environment_variables import OTEL_TRACES_EXPORTER
 
 
 class TestDistribution(TestCase):
@@ -31,6 +31,6 @@ def test_package_available(self):
 
     def test_default_configuration(self):
         distro = OpenTelemetryDistro()
-        self.assertIsNone(os.environ.get(OTEL_TRACE_EXPORTER))
+        self.assertIsNone(os.environ.get(OTEL_TRACES_EXPORTER))
         distro.configure()
-        self.assertEqual("otlp_span", os.environ.get(OTEL_TRACE_EXPORTER))
+        self.assertEqual("otlp_span", os.environ.get(OTEL_TRACES_EXPORTER))

opentelemetry-instrumentation/src/opentelemetry/instrumentation/auto_instrumentation/__init__.py

@@ -23,7 +23,7 @@
 from opentelemetry.environment_variables import (
     OTEL_PYTHON_IDS_GENERATOR,
     OTEL_PYTHON_SERVICE_NAME,
-    OTEL_TRACE_EXPORTER,
+    OTEL_TRACES_EXPORTER,
 )
 
 logger = getLogger(__file__)
@@ -82,7 +82,7 @@ def parse_args():
 
 def load_config_from_cli_args(args):
     if args.trace_exporter:
-        environ[OTEL_TRACE_EXPORTER] = args.trace_exporter
+        environ[OTEL_TRACES_EXPORTER] = args.trace_exporter
     if args.service_name:
         environ[OTEL_PYTHON_SERVICE_NAME] = args.service_name
     if args.ids_generator:

opentelemetry-instrumentation/tests/test_run.py

@@ -20,7 +20,7 @@
 
 from opentelemetry.environment_variables import (
     OTEL_PYTHON_SERVICE_NAME,
-    OTEL_TRACE_EXPORTER,
+    OTEL_TRACES_EXPORTER,
 )
 from opentelemetry.instrumentation import auto_instrumentation
 
@@ -111,13 +111,13 @@ class TestArgs(TestCase):
     def test_exporter(self, _):  # pylint: disable=no-self-use
         with patch("sys.argv", ["instrument", "2"]):
             auto_instrumentation.run()
-            self.assertIsNone(environ.get(OTEL_TRACE_EXPORTER))
+            self.assertIsNone(environ.get(OTEL_TRACES_EXPORTER))
 
         with patch(
             "sys.argv", ["instrument", "--trace-exporter", "jaeger", "1", "2"]
         ):
             auto_instrumentation.run()
-            self.assertEqual(environ.get(OTEL_TRACE_EXPORTER), "jaeger")
+            self.assertEqual(environ.get(OTEL_TRACES_EXPORTER), "jaeger")
 
     @patch("opentelemetry.instrumentation.auto_instrumentation.execl")
     def test_service_name(self, _):  # pylint: disable=no-self-use

opentelemetry-sdk/src/opentelemetry/sdk/environment_variables/__init__.py

@@ -14,8 +14,8 @@
 
 OTEL_RESOURCE_ATTRIBUTES = "OTEL_RESOURCE_ATTRIBUTES"
 OTEL_LOG_LEVEL = "OTEL_LOG_LEVEL"
-OTEL_TRACE_SAMPLER = "OTEL_TRACE_SAMPLER"
-OTEL_TRACE_SAMPLER_ARG = "OTEL_TRACE_SAMPLER_ARG"
+OTEL_TRACES_SAMPLER = "OTEL_TRACES_SAMPLER"
+OTEL_TRACES_SAMPLER_ARG = "OTEL_TRACES_SAMPLER_ARG"
 OTEL_BSP_SCHEDULE_DELAY = "OTEL_BSP_SCHEDULE_DELAY"
 OTEL_BSP_EXPORT_TIMEOUT = "OTEL_BSP_EXPORT_TIMEOUT"
 OTEL_BSP_MAX_QUEUE_SIZE = "OTEL_BSP_MAX_QUEUE_SIZE"

opentelemetry-sdk/src/opentelemetry/sdk/trace/sampling.py

@@ -60,8 +60,8 @@
     with trace.get_tracer(__name__).start_as_current_span("Test Span"):
         ...
 
-The tracer sampler can also be configured via environment variables ``OTEL_TRACE_SAMPLER`` and ``OTEL_TRACE_SAMPLER_ARG`` (only if applicable).
-The list of known values for ``OTEL_TRACE_SAMPLER`` are:
+The tracer sampler can also be configured via environment variables ``OTEL_TRACES_SAMPLER`` and ``OTEL_TRACES_SAMPLER_ARG`` (only if applicable).
+The list of known values for ``OTEL_TRACES_SAMPLER`` are:
 
     * always_on - Sampler that always samples spans, regardless of the parent span's sampling decision.
     * always_off - Sampler that never samples spans, regardless of the parent span's sampling decision.
@@ -70,10 +70,10 @@
     * parentbased_always_off - Sampler that respects its parent span's sampling decision, but otherwise never samples.
     * parentbased_traceidratio - Sampler that respects its parent span's sampling decision, but otherwise samples probabalistically based on rate.
 
-Sampling probability can be set with ``OTEL_TRACE_SAMPLER_ARG`` if the sampler is traceidratio or parentbased_traceidratio, when not provided rate will be set to 1.0 (maximum rate possible).
+Sampling probability can be set with ``OTEL_TRACES_SAMPLER_ARG`` if the sampler is traceidratio or parentbased_traceidratio, when not provided rate will be set to 1.0 (maximum rate possible).
 
 
-Prev example but with environment vairables. Please make sure to set the env ``OTEL_TRACE_SAMPLER=traceidratio`` and ``OTEL_TRACE_SAMPLER_ARG=0.001``.
+Prev example but with environment vairables. Please make sure to set the env ``OTEL_TRACES_SAMPLER=traceidratio`` and ``OTEL_TRACES_SAMPLER_ARG=0.001``.
 
 .. code:: python
 
@@ -105,8 +105,8 @@
 # pylint: disable=unused-import
 from opentelemetry.context import Context
 from opentelemetry.sdk.environment_variables import (
-    OTEL_TRACE_SAMPLER,
-    OTEL_TRACE_SAMPLER_ARG,
+    OTEL_TRACES_SAMPLER,
+    OTEL_TRACES_SAMPLER_ARG,
 )
 from opentelemetry.trace import Link, get_current_span
 from opentelemetry.trace.span import TraceState
@@ -370,17 +370,17 @@ def __init__(self, rate: float):
 
 def _get_from_env_or_default() -> Sampler:
     trace_sampler = os.getenv(
-        OTEL_TRACE_SAMPLER, "parentbased_always_on"
+        OTEL_TRACES_SAMPLER, "parentbased_always_on"
     ).lower()
     if trace_sampler not in _KNOWN_SAMPLERS:
         _logger.warning("Couldn't recognize sampler %s.", trace_sampler)
         trace_sampler = "parentbased_always_on"
 
     if trace_sampler in ("traceidratio", "parentbased_traceidratio"):
         try:
-            rate = float(os.getenv(OTEL_TRACE_SAMPLER_ARG))
+            rate = float(os.getenv(OTEL_TRACES_SAMPLER_ARG))
         except ValueError:
-            _logger.warning("Could not convert TRACE_SAMPLER_ARG to float.")
+            _logger.warning("Could not convert TRACES_SAMPLER_ARG to float.")
             rate = 1.0
         return _KNOWN_SAMPLERS[trace_sampler](rate)
 

opentelemetry-sdk/tests/trace/test_trace.py

@@ -30,8 +30,8 @@
     OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT,
     OTEL_SPAN_EVENT_COUNT_LIMIT,
     OTEL_SPAN_LINK_COUNT_LIMIT,
-    OTEL_TRACE_SAMPLER,
-    OTEL_TRACE_SAMPLER_ARG,
+    OTEL_TRACES_SAMPLER,
+    OTEL_TRACES_SAMPLER_ARG,
 )
 from opentelemetry.sdk.trace import Resource, sampling
 from opentelemetry.sdk.trace.ids_generator import RandomIdsGenerator
@@ -194,7 +194,7 @@ def test_sampler_no_sampling(self):
             trace_api.TraceFlags.DEFAULT,
         )
 
-    @mock.patch.dict("os.environ", {OTEL_TRACE_SAMPLER: "always_off"})
+    @mock.patch.dict("os.environ", {OTEL_TRACES_SAMPLER: "always_off"})
     def test_sampler_with_env(self):
         # pylint: disable=protected-access
         reload(trace)
@@ -213,8 +213,8 @@ def test_sampler_with_env(self):
     @mock.patch.dict(
         "os.environ",
         {
-            OTEL_TRACE_SAMPLER: "parentbased_traceidratio",
-            OTEL_TRACE_SAMPLER_ARG: "0.25",
+            OTEL_TRACES_SAMPLER: "parentbased_traceidratio",
+            OTEL_TRACES_SAMPLER_ARG: "0.25",
         },
     )
     def test_ratio_sampler_with_env(self):