To remediate the PostgreSQL Log Checkpoints Flag Should Be Disabled issue in GCP using GCP CLI, follow these steps:

1. Open the Cloud Shell in your GCP console.
2. Run the following command to list all the Cloud SQL instances in your project:

   gcloud sql instances list
   

3. Note down the instance name of the PostgreSQL instance that you want to remediate.
4. Run the following command to update the instance settings:

   gcloud sql instances patch [INSTANCE_NAME] --database-flags log_checkpoints=off
   

   Replace [INSTANCE_NAME] with the actual name of your PostgreSQL instance.
5. Wait for a few minutes for the instance settings to be updated.

After following these steps, the PostgreSQL Log Checkpoints Flag will be disabled for your GCP PostgreSQL instance, and the misconfiguration will be remediated.

To remediate the PostgreSQL Log Checkpoints Flag Should Be Disabled misconfiguration for GCP using Python, you can follow these steps:

1. First, you need to authenticate to your GCP project using the google-auth and google-auth-oauthlib libraries. You can do this by running the following code:

from google.oauth2 import service_account
from google.auth.transport.requests import Request
from googleapiclient.discovery import build

# Replace [PATH_TO_SERVICE_ACCOUNT_KEY] with the path to your service account key file
credentials = service_account.Credentials.from_service_account_file('[PATH_TO_SERVICE_ACCOUNT_KEY]')
project_id = '[YOUR_PROJECT_ID]'

# Authenticate to the Cloud SQL Admin API
service = build('sqladmin', 'v1beta4', credentials=credentials)

2. Once you have authenticated, you can use the Cloud SQL Admin API to retrieve the configuration settings for your PostgreSQL instance. You can do this by running the following code:

# Replace [INSTANCE_NAME] with the name of your PostgreSQL instance
instance_name = '[INSTANCE_NAME]'

# Retrieve the current configuration settings for the instance
settings = service.instances().get(project=project_id, instance=instance_name).execute()['settings']

3. Next, you need to check if the log_checkpoints flag is enabled in the configuration settings. You can do this by running the following code:

# Check if the log_checkpoints flag is enabled
if 'log_checkpoints' in settings and settings['log_checkpoints'] == True:
    # Disable the log_checkpoints flag
    settings['log_checkpoints'] = False

4. Finally, you need to update the configuration settings for the PostgreSQL instance with the new flag settings. You can do this by running the following code:

# Update the configuration settings for the instance
request_body = {
    'settings': settings,
    'updateMask': 'settings'
}

# Send the update request to the Cloud SQL Admin API
response = service.instances().patch(project=project_id, instance=instance_name, body=request_body).execute()

With these steps, you should be able to remediate the PostgreSQL Log Checkpoints Flag Should Be Disabled misconfiguration for your GCP PostgreSQL instance using Python.