List and delete unused target pool in google cloud

Target pool is defined as a group of instance in google cloud which integrate with a forwarding rule that handles TCP and UDP traffic.

Below is the script to list all unused target group and store in a file, and delete it.

Some variables defined in the script:

FILENAME: To store unused target pools list.

REGION: GCP Region

PROJECT: GCP Project

Functions defined in the script:

get_unused_target_pool: Get unused target pool and store the info in a file.

delete_unused_target_pool: Read values from the file and delete the file