1. Go to the Google Cloud Console and select the project that contains the database that needs to be remediated.
2. Navigate to the Cloud SQL instances page and select the instance that needs to be remediated.
3. Click on the “Edit” button at the top of the page to edit the instance settings.
4. Scroll down to the “SSL” section and click on “Change” next to “Server Certificate”.
5. Select the option to “Create a new certificate” and enter the required information, such as the certificate name and the certificate expiration date.
6. Click on “Create” to generate the new SSL certificate.
7. Once the new certificate is created, click on “Save” to save the changes to the database instance.
8. Finally, set up a reminder or schedule to rotate the SSL certificate every 90 days to ensure that the certificate is always up-to-date.

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1. Open the Cloud Shell in the GCP Console.
2. Run the following command to list all the available instances:

gcloud sql instances list

3. Select the instance for which you want to rotate the SSL certificate and run the following command:

gcloud sql instances patch [INSTANCE_NAME] --database-flags ssl-cert-validity-period=90

4. Replace [INSTANCE_NAME] with the name of your instance.
5. This command sets the validity period of the SSL certificate to 90 days. You can change the value as per your requirement.
6. Once the command is executed successfully, the SSL certificate for the selected instance will be rotated every 90 days.

1. First, you need to create a Cloud Function in GCP to rotate the SSL certificate. To create a Cloud Function, follow the instructions given in the official documentation.
2. After creating the Cloud Function, you need to write a Python script that will rotate the SSL certificate. Here is an example script:

import google.auth
from google.cloud import spanner_v1
from datetime import datetime, timedelta

def rotate_ssl_certificate(request):
    # Authenticate with GCP
    credentials, project_id = google.auth.default()
    
    # Set the instance ID and database ID
    instance_id = 'your-instance-id'
    database_id = 'your-database-id'
    
    # Create a Spanner client
    spanner_client = spanner_v1.Client(project=project_id, credentials=credentials)
    
    # Get the instance and database objects
    instance = spanner_client.instance(instance_id)
    database = instance.database(database_id)
    
    # Get the current SSL certificate expiration date
    current_cert = database.get_iam_policy().bindings[0].condition.time
        
    # Calculate the new expiration date (90 days from now)
    new_cert = datetime.now() + timedelta(days=90)
    
    # Update the SSL certificate
    database.update_ddl([f"ALTER DATABASE `{database_id}` SET OPTIONS (ssl_cert_expiration='{new_cert.isoformat()}')"])
    
    # Return a success message
    return f"SSL certificate updated. New expiration date: {new_cert.isoformat()}"

3. In the above script, replace your-instance-id and your-database-id with the actual IDs of your Spanner instance and database.
4. Deploy the Cloud Function by clicking on the “Deploy” button in the Cloud Function console.
5. Finally, you need to schedule the Cloud Function to run every 90 days. To do this, go to the Cloud Scheduler console and create a new job. Set the frequency to “every 90 days” and the target to the Cloud Function you just created.