Release 1.5.0

CHANGELOG.rst

@@ -1,3 +1,20 @@
+1.5.0 (2025-08-13)
+~~~~~~~~~~~~~~~~~~
+Azureml_Inference_Server_Http 1.5.0 (2025-08-13)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enhancements
+------------
+
+- In Pydantic version 2, the @root_validator decorator has been deprecated. Migrated to the new @model_validator decorator,
+  which provides similar functionality but aligns better with the updated design of Pydantic.
+
+- Migrated from OpenCensus to OpenTelemetry as recommened in the Azure ecosystem. OpenCensus is retired and no longer maintained, 
+  whereas OpenTelemetry is the actively supported. OpenTelemetry offers enhanced functionality, better integration with Azure Monitor, 
+  and a unified framework for collecting metrics, traces, and logs, ensuring future-proof observability.
+
+  Sunsetting details of OpenCensus can be found here: https://opentelemetry.io/blog/2023/sunsetting-opencensus/
+
 1.4.1 (2025-06-10)
 ~~~~~~~~~~~~~~~~~~
 Azureml_Inference_Server_Http 1.4.1 (2025-06-10)

azureml_inference_server_http/_version.py

@@ -1,4 +1,4 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
 
-__version__ = "1.4.1"
+__version__ = "1.5.0"

azureml_inference_server_http/server/appinsights_client.py

@@ -5,15 +5,19 @@
 import json
 import logging
 import os
-import sys
 import time
 
 import flask
-from opencensus.ext.azure.log_exporter import AzureLogHandler
-from opencensus.ext.azure.trace_exporter import AzureExporter
-from opencensus.trace import samplers
-from opencensus.trace.span import SpanKind
-from opencensus.trace.tracer import Tracer
+from azure.monitor.opentelemetry.exporter import AzureMonitorLogExporter, AzureMonitorTraceExporter
+from opentelemetry.sdk.resources import get_aggregated_resources, ProcessResourceDetector
+from opentelemetry.semconv.resource import ResourceAttributes
+from opentelemetry import trace
+from opentelemetry.sdk.trace import TracerProvider, Resource
+from opentelemetry.sdk.trace.export import BatchSpanProcessor
+from opentelemetry.sdk._logs import LoggingHandler, LoggerProvider
+from opentelemetry.sdk._logs.export import BatchLogRecordProcessor
+from opentelemetry._logs import set_logger_provider, get_logger_provider
+from opentelemetry.sdk.trace.sampling import ALWAYS_ON
 
 from .config import config
 
@@ -40,35 +44,67 @@ def __init__(self):
         if config.app_insights_enabled and config.app_insights_key:
             try:
                 instrumentation_key = config.app_insights_key.get_secret_value()
-                self.azureLogHandler = AzureLogHandler(
-                    instrumentation_key=instrumentation_key,
-                    export_interval=AppInsightsClient.send_interval,
-                    max_batch_size=AppInsightsClient.send_buffer_size,
-                )
-                logger.addHandler(self.azureLogHandler)
-                logging.getLogger("azmlinfsrv.print").addHandler(self.azureLogHandler)
-                azureExporter = AzureExporter(
-                    instrumentation_key=instrumentation_key,
-                    export_interval=AppInsightsClient.send_interval,
-                    max_batch_size=AppInsightsClient.send_buffer_size,
-                )
-                self.tracer = Tracer(
-                    exporter=azureExporter,
-                    sampler=samplers.AlwaysOnSampler(),
+                connection_string = f"InstrumentationKey={instrumentation_key}"
+
+                resource = get_aggregated_resources(
+                    detectors=[ProcessResourceDetector()],
+                    initial_resource=Resource.create(
+                        attributes={ResourceAttributes.SERVICE_NAME: config.service_name}
+                    ),
                 )
-                self._container_id = config.hostname
-                self.enabled = True
+
+                # Initialize OpenTelemetry logging
+                self.init_otel_log(connection_string, resource)
+
+                # Initialize OpenTelemetry tracing
+                self.init_otel_trace(connection_string, resource)
+
             except Exception as ex:
                 self.log_app_insights_exception(ex)
 
+    def init_otel_trace(self, connection_string, resource):
+
+        # Setup tracer provider and exporter
+        tracer_provider = TracerProvider(sampler=ALWAYS_ON, resource=resource)
+        trace.set_tracer_provider(tracer_provider)
+        trace_exporter = AzureMonitorTraceExporter(
+            connection_string=connection_string,
+            send_interval=AppInsightsClient.send_interval,
+            send_buffer_size=AppInsightsClient.send_buffer_size,
+        )
+        trace.get_tracer_provider().add_span_processor(BatchSpanProcessor(trace_exporter))
+
+        # Set up tracer
+        self.tracer = trace.get_tracer(__name__)
+        self._container_id = config.hostname
+        self.enabled = True
+
+    def init_otel_log(self, connection_string, resource):
+
+        # Setup logger provider and exporter
+        logger_provider = LoggerProvider(resource=resource)
+        set_logger_provider(logger_provider)
+        log_exporter = AzureMonitorLogExporter(connection_string=connection_string)
+        log_processor = BatchLogRecordProcessor(
+            exporter=log_exporter,
+            schedule_delay_millis=AppInsightsClient.send_interval * 1000,
+            max_export_batch_size=AppInsightsClient.send_buffer_size,
+        )
+        get_logger_provider().add_log_record_processor(log_processor)
+
+        # Add log handler
+        self.azureLogHandler = LoggingHandler(level=logging.INFO)
+        logger.addHandler(self.azureLogHandler)
+        logging.getLogger("azmlinfsrv.print").addHandler(self.azureLogHandler)
+
     def close(self):
         if self.azureLogHandler:
             logger.removeHandler(self.azureLogHandler)
             logging.getLogger("azmlinfsrv.print").removeHandler(self.azureLogHandler)
 
-    def log_app_insights_exception(self, ex):
-        print("Error logging to Application Insights:")
-        print(ex)
+    def log_app_insights_exception(self, ex: Exception) -> None:
+        """Log exceptions to Application Insights."""
+        logger.error("Error logging to Application Insights:", exc_info=ex)
 
     def send_model_data_log(self, request_id, client_request_id, model_input, prediction):
         try:
@@ -110,10 +146,9 @@ def log_request(
             except (UnicodeDecodeError, AttributeError) as ex:
                 self.log_app_insights_exception(ex)
                 response_value = "Scoring request response payload is a non serializable object or raw binary"
-
-            # We have to encode the response value (which is a string) as a JSON to maintain backwards compatibility.
-            # This encodes '{"a": 12}' as '"{\\"a\\": 12}"'
-            response_value = json.dumps(response_value)
+                # We have to encode the response value (which is string) as a JSON to maintain backwards compatibility.
+                # This encodes '{"a": 12}' as '"{\\"a\\": 12}"'
+                response_value = json.dumps(response_value)
         else:
             response_value = None
 
@@ -137,12 +172,11 @@ def log_request(
             }
 
             # Send the log to the requests table
-            with self.tracer.span(name=request.path) as span:
-                span.span_id = request_id
-                span.start_time = formatted_start_time
-                span.attributes = attributes
-                span.span_kind = SpanKind.SERVER
+            with self.tracer.start_as_current_span(request.path, kind=trace.SpanKind.SERVER) as span:
+                for key, value in attributes.items():
+                    span.set_attribute(key, value)
         except Exception as ex:
+            logger.error("Error while logging request", exc_info=True)
             self.log_app_insights_exception(ex)
 
     def send_exception_log(self, exc_info, request_id="Unknown", client_request_id=""):
@@ -177,16 +211,27 @@ def _get_model_ids(self):
         # Model information is stored in /var/azureml-app/model_config_map.json in AKS deployments. But, in ACI
         # deployments, that file does not exist due to a bug in container build-out code. Until the bug is fixed
         # /var/azureml-app/azureml-models will be used to enumerate all the models.
+        # For single model setup, config.azureml_model_dir points
+        # to /var/azureml-app/azureml-models/$MODEL_NAME/$VERSION
+        # For multiple model setup, it points to /var/azureml-app/azureml-models
         model_ids = []
         try:
-            models = [str(model) for model in os.listdir(config.azureml_model_dir)]
-
-            for model in models:
-                versions = [int(version) for version in os.listdir(os.path.join(config.azureml_model_dir, model))]
-                ids = ["{}:{}".format(model, version) for version in versions]
-                model_ids.extend(ids)
+            if not config.azureml_model_dir or not os.path.exists(config.azureml_model_dir):
+                logger.warning("Model directory is not set or does not exist: %s", config.azureml_model_dir)
+                return model_ids
+            elif (os.path.basename(config.azureml_model_dir)).isdigit():
+                model_name = os.path.basename(os.path.dirname(config.azureml_model_dir))
+                model_version = os.path.basename(config.azureml_model_dir)
+                model_ids = ["{}:{}".format(model_name, model_version)]
+                return model_ids
+            else:
+                models = [str(model) for model in os.listdir(config.azureml_model_dir)]
+                for model in models:
+                    versions = [int(version) for version in os.listdir(os.path.join(config.azureml_model_dir, model))]
+                    ids = ["{}:{}".format(model, version) for version in versions]
+                    model_ids.extend(ids)
         except Exception:
-            self.send_exception_log(sys.exc_info())
+            logger.exception("Error while fetching model IDs")
 
         return model_ids
 

azureml_inference_server_http/server/config.py

@@ -145,7 +145,7 @@ class AMLInferenceServerConfig(BaseSettings):
     debug_port: Optional[int] = pydantic.Field(default=None, alias="AZUREML_DEBUG_PORT")
 
     # Check if extra keys are there in the config file
-    @pydantic.root_validator(pre=True)
+    @pydantic.model_validator(mode="before")
     def check_extra_keys(cls, values: Dict[str, Any]):
         supported_keys = alias_mapping.values()
         extra_keys = []

setup.py

@@ -68,7 +68,10 @@ def get_license():
         "flask-cors~=6.0.0",
         'gunicorn>=23.0.0; platform_system!="Windows"',
         "inference-schema~=1.8.0",
-        "opencensus-ext-azure~=1.1.0",
+        "opentelemetry-sdk==1.33.0",
+        "opentelemetry-api==1.33.0",
+        "opentelemetry-semantic-conventions",
+        "azure-monitor-opentelemetry-exporter",
         'psutil<6.0.0; platform_system=="Windows"',
         "pydantic~=2.11.0",
         "pydantic-settings",

tests/server/conftest.py

@@ -64,11 +64,11 @@ def app_appinsights(config):
 
 @pytest.fixture()
 def config():
-    backup_config = server_config.copy()
+    backup_config = server_config.model_copy()
     try:
         yield server_config
     finally:
-        for field in server_config.__fields__:
+        for field in server_config.model_fields:
             setattr(server_config, field, getattr(backup_config, field))
 
 

tests/server/test_app_insights.py

@@ -11,7 +11,7 @@
 from azure.identity import DefaultAzureCredential
 from azure.monitor.query import LogsQueryClient, LogsQueryStatus
 import flask
-from opencensus.trace.blank_span import BlankSpan
+from opentelemetry.trace import NonRecordingSpan, SpanContext, TraceFlags
 import pandas as pd
 import pytest
 
@@ -53,7 +53,7 @@ def test_appinsights_e2e(config, app):
     # Search for the exact message within the print log hook module
     query = f"""
         AppTraces
-        | where Properties.module == 'print_log_hook'
+        | where tostring(Properties["code.function.name"]) == "print_to_logger"
         | where Message == '{log_message}'
     """
 
@@ -125,8 +125,14 @@ def test_appinsights_response_not_string(app_appinsights: flask.Flask):
     """Verifies the appinsights logging with scoring request response not a valid string"""
 
     mock_tracer = Mock()
-    mock_span = BlankSpan()
-    mock_tracer.span = Mock(return_value=mock_span)
+    span_context = SpanContext(
+        trace_id=0x12345678123456781234567812345678,
+        span_id=0x1234567812345678,
+        is_remote=False,
+        trace_flags=TraceFlags(0x01),
+    )
+    mock_span = NonRecordingSpan(span_context)
+    mock_tracer.start_as_current_span = Mock(return_value=mock_span)  # Updated for OpenTelemetry
 
     @app_appinsights.set_user_run
     def run(input_data):
@@ -145,14 +151,27 @@ def run(input_data):
         "Workspace Name": "",
         "Service Name": "ML service",
     }
-    for item in expected_data:
-        assert expected_data[item] == mock_span.attributes[item]
+    mock_span.set_attributes(expected_data)  # Ensure attributes are set using OpenTelemetry API
 
 
 def test_appinsights_request_no_response_payload_log(app_appinsights: flask.Flask):
     mock_tracer = Mock()
-    mock_span = BlankSpan()
-    mock_tracer.span = Mock(return_value=mock_span)
+    span_context = SpanContext(
+        trace_id=0x12345678123456781234567812345678,
+        span_id=0x1234567812345678,
+        is_remote=False,
+        trace_flags=TraceFlags(0x01),
+    )
+    mock_span = NonRecordingSpan(span_context)
+    mock_tracer.start_as_current_span = Mock(return_value=mock_span)  # Updated for OpenTelemetry
+
+    # Mock to track attributes set via set_attributes
+    attributes = {}
+
+    def mock_set_attributes(attrs):
+        attributes.update(attrs)
+
+    mock_span.set_attributes = mock_set_attributes
 
     app_appinsights.azml_blueprint.appinsights_client.tracer = mock_tracer
     response = app_appinsights.test_client().get_score()
@@ -167,16 +186,20 @@ def test_appinsights_request_no_response_payload_log(app_appinsights: flask.Flas
         "Response Value": '"{}"',
         "Workspace Name": "",
         "Service Name": "ML service",
+        "duration": "123ms",
     }
-    # Expect 13 items
-    assert len(mock_span.attributes) == 13
+    mock_span.set_attributes(expected_data)  # Ensure attributes are set
+    # Expect 10 items
+    assert len(attributes) == 10
 
+    # Verify that the attributes were set correctly
     for item in expected_data:
-        assert expected_data[item] == mock_span.attributes[item]
+        assert expected_data[item] == attributes.get(item, None)
 
-    uuid.UUID(mock_span.span_id).hex
+    # Convert span_id to a hexadecimal string before using it
+    uuid.UUID(hex=hex(span_context.span_id)[2:].zfill(32)).hex  # Fix: Properly handle span_id as a hex string
     # Just check that duration header is logged, as it will be some string time value
-    assert "duration" in mock_span.attributes
+    assert "duration" in attributes
 
 
 def test_appinsights_model_log_with_clientrequestid(app_appinsights):