Fix issues 8253, 12325, 11942, 11566, 12580, 14117

[manish08k]

Description

This PR addresses the following issues in python-docs-samples:

• Remove old Cloud SQL region tags once docs have been updated #8253 — Fix Cloud SQL region tags
• The readme.md file shows "How to run a sample" but there's no requirements.txt in the referenced folder. #12325 — Add/update logging requirements
• Provide canonical example in AUTHORING_GUIDE.md #11942 — Update authoring guide link
• missing Dockerfile #11566 — Update Eventarc storage handler Dockerfile
• REGEX not matching all composer versions #12580 — Fix Composer regex handling
• chore(generative_ai) Update model references for generative_ai samples #14117 — Update Gemini model references

Changes

• Updated Cloud SQL sample region tag configuration.
• Added the required logging dependency configuration.
• Updated the authoring guide reference.
• Replaced the Eventarc storage handler Procfile with a Dockerfile.
• Updated Composer regex handling.
• Updated Gemini model references across the affected samples.

Testing

• Applied all changes cleanly.
• Ran git diff --check.
• Verified the resulting changes before committing.

Related Issues

Fixes #8253
Fixes #12325
Fixes #11942
Fixes #11566
Fixes #12580
Fixes #14117

[snippet-bot]

Here is the summary of changes.

You are about to delete 3 region tags.

• cloud-sql/mysql/sqlalchemy/connect_tcp.py:17, tag cloud_sql_mysql_sqlalchemy_sslcerts
• cloud-sql/postgres/sqlalchemy/connect_tcp.py:17, tag cloud_sql_postgres_sqlalchemy_sslcerts
• cloud-sql/sql-server/sqlalchemy/connect_tcp.py:17, tag cloud_sql_sqlserver_sqlalchemy_sslcerts

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[gemini-code-assist]

Code Review

This pull request updates various samples to use the gemini-2.5-flash model, cleans up region tags in Cloud SQL SQLAlchemy samples, refactors Composer DAG version parsing to handle optional components, and adds a Dockerfile for the Eventarc storage handler. Feedback on these changes includes a recommendation to define WORKDIR earlier in the new Dockerfile to prevent copying dependency manifests to the root directory, and a reminder to pin the newly added google-cloud-logging dependency to a specific version in accordance with the repository's style guidelines.

[gemini-code-assist]

Setting the working directory (WORKDIR) after copying and installing dependencies causes requirements.txt to be copied to the root directory (/) of the container. It is a best practice to define WORKDIR first so that all subsequent copy and run commands are executed within the designated application directory (e.g., /app), keeping the container filesystem clean and organized.

ENV APP_HOME /app
WORKDIR $APP_HOME

# Copy application dependency manifests to the container image.
# Copying this separately prevents re-running pip install on every code change.
COPY requirements.txt ./

# Install production dependencies.
RUN pip install -r requirements.txt

COPY . ./

[gemini-code-assist]

According to the repository's AUTHORING_GUIDE.md, all dependencies in requirements.txt should be pinned to a specific version using == to ensure reproducible environments and prevent unexpected breakages from upstream updates.

google-cloud-logging==3.4.0

References

1. All dependencies should be pinned to a specific version, as in this example: Flask==1.1.1 ^(link)