Drop Python 3.8 Support in ADOT SDK (#381)

## What does this pull request do?
Removes Python 3.8 support in our ADOT SDK since it has reached 6 months
past EoL, which is the duration that upstream OTel commits to
supporting.

Found all references to Python 3.8 via [GitHub repo
search](https://github.com/search?q=repo%3Aaws-observability%2Faws-otel-python-instrumentation%203.8&type=code).

By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice.

Author: yiyuan-he

.github/workflows/application-signals-e2e-test.yml

@@ -46,17 +46,6 @@ jobs:
   # DEFAULT SETTING: {Python Version}, EC2, AMD64, AL2
   #
 
-  default-py38-amd64:
-    needs: [ upload-main-build ]
-    uses: aws-observability/aws-application-signals-test-framework/.github/workflows/python-ec2-default-test.yml@main
-    secrets: inherit
-    with:
-      aws-region: us-east-1
-      caller-workflow-name: 'main-build'
-      python-version: '3.8'
-      cpu-architecture: 'x86_64'
-      staging-wheel-name: ${{ inputs.staging-wheel-name }}
-
   default-py39-amd64:
     needs: [ upload-main-build ]
     uses: aws-observability/aws-application-signals-test-framework/.github/workflows/python-ec2-default-test.yml@main
@@ -106,16 +95,6 @@ jobs:
   # DEFAULT SETTING: {Python Version}, EKS, AMD64, AL2
   #
 
-  eks-py38-amd64:
-    uses: aws-observability/aws-application-signals-test-framework/.github/workflows/python-eks-test.yml@main
-    secrets: inherit
-    with:
-      aws-region: us-east-1
-      test-cluster-name: 'e2e-python-adot-test'
-      adot-image-name: ${{ inputs.adot-image-name }}
-      caller-workflow-name: 'main-build'
-      python-version: '3.8'
-
   eks-py39-amd64:
     if: ${{ always() }}
     needs: eks-py38-amd64

.github/workflows/pr_build.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false # ensures the entire test matrix is run, even if one permutation fails
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11"]
     steps:
       - name: Checkout Repo @ SHA - ${{ github.sha }}
         uses: actions/checkout@v4

Dockerfile

@@ -18,19 +18,7 @@ ADD aws-opentelemetry-distro/ ./aws-opentelemetry-distro/
 # * https://github.com/MicrosoftDocs/azure-docs/blob/main/articles/azure-functions/recover-python-functions.md#troubleshoot-cannot-import-cygrpc
 RUN sed -i "/opentelemetry-exporter-otlp-proto-grpc/d" ./aws-opentelemetry-distro/pyproject.toml
 
-# urllib3 recently made a release that drops support for Python 3.8
-# Our sdk depends on botocore which pulls in the version of urllib3 based Python runtime it detects.
-# The rule is that if current pip command version is > 3.9 botocore will pick up the latest urllib3,
-# otherwise it picks up the older urllib3 that is compatible with Python 3.8.
-# https://github.com/boto/botocore/blob/develop/requirements-docs.txt
-# Since this Dockerfile currently uses the fixed Python 3.11 base image to pull the required dependencies,
-# EKS and ECS applications will encounter a runtime error for Python 3.8 compatibility.
-# Our fix is to temporarily restrict the urllib3 version to one that works for all supported Python versions 
-# that we currently commit to support (notably 3.8). 
-# We also pin the setuptools version for similar issues with the library dropping 3.8 support.
-# https://github.com/pypa/setuptools/blame/main/pkg_resources/__init__.py#L24
-# TODO: Remove these temporary workarounds once we deprecate Python 3.8 support since it has reached end-of-life.
-RUN mkdir workspace && pip install setuptools==75.2.0 urllib3==2.2.3 --target workspace ./aws-opentelemetry-distro
+RUN mkdir workspace && pip install --target workspace ./aws-opentelemetry-distro
 
 # Stage 2: Build the cp-utility binary
 FROM public.ecr.aws/docker/library/rust:1.82 as builder

README.md

@@ -35,7 +35,7 @@ This project is licensed under the Apache-2.0 License.
 ## Notices
 
 ### Python Version Support
-This project ensures compatibility with the following supported Python versions: 3.8, 3.9, 3.10, 3.11, 3.12
+This project ensures compatibility with the following supported Python versions: 3.9, 3.10, 3.11, 3.12
 
 ### Note on Amazon CloudWatch Application Signals
 [Amazon CloudWatch Application Signals](https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-Application-Monitoring-Sections.html) components are designed to seamlessly work with all library instrumentations offered by [OpenTelemetry Python auto-instrumentation](https://github.com/open-telemetry/opentelemetry-python-contrib/blob/main/instrumentation/README.md). While upstream OpenTelemetry Python instrumentations are in beta, Application Signals components are stable, production ready and have also been tested for popular libraries/frameworks such as [Django, Boto3, and others](https://github.com/aws-observability/aws-otel-python-instrumentation/tree/main/contract-tests/images/applications). We will prioritize backward compatibility for Application Signals components, striving to ensure that they remain functional even in the face of potential breaking changes introduced by OpenTelemetry upstream libraries. Please [raise an issue](https://github.com/aws-observability/aws-otel-python-instrumentation/blob/main/CONTRIBUTING.md#reporting-bugsfeature-requests) if you notice Application Signals doesn't work for a particular OpenTelemetry supported library.

aws-opentelemetry-distro/pyproject.toml

@@ -8,7 +8,7 @@ dynamic = ["version"]
 description = "AWS OpenTelemetry Python Distro"
 readme = "README.rst"
 license = "Apache-2.0"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 authors = [
   { name = "Amazon Web Services" },
 ]
@@ -18,7 +18,6 @@ classifiers = [
   "License :: OSI Approved :: Apache Software License",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",

contract-tests/images/applications/botocore/pyproject.toml

@@ -3,4 +3,4 @@ name = "botocore-server"
 description = "Simple server that relies on botocore library"
 version = "1.0.0"
 license = "Apache-2.0"
-requires-python = ">=3.8"
+requires-python = ">=3.9"

contract-tests/images/applications/django/pyproject.toml

@@ -3,4 +3,4 @@ name = "django-server"
 description = "Simple server that relies on django library"
 version = "1.0.0"
 license = "Apache-2.0"
-requires-python = ">=3.8"
+requires-python = ">=3.9"

contract-tests/images/applications/mysql-connector/pyproject.toml

@@ -3,4 +3,4 @@ name = "mysql-connector-server"
 description = "Simple server that relies on mysql-connector library"
 version = "1.0.0"
 license = "Apache-2.0"
-requires-python = ">=3.8"
+requires-python = ">=3.9"

contract-tests/images/applications/mysqlclient/pyproject.toml

@@ -3,4 +3,4 @@ name = "mysqlclient-server"
 description = "Simple server that relies on mysqlclient library"
 version = "1.0.0"
 license = "Apache-2.0"
-requires-python = ">=3.8"
+requires-python = ">=3.9"

contract-tests/images/applications/psycopg2/pyproject.toml

@@ -3,4 +3,4 @@ name = "psycopg2-server"
 description = "Simple server that relies on psycopg2 library"
 version = "1.0.0"
 license = "Apache-2.0"
-requires-python = ">=3.8"
+requires-python = ">=3.9"