AWS Application Load Balancer unhealthy check

Prerequisites
Python3
boto3 extention (using: pip install boto3)
AWS cli installed
AWS Access key, Secret key and Region configured

Usage
./ecs_metric.py [-h] [--targetgroup TARGETGROUP] [--loadbalancer LOADBALANCER] [--period PERIOD] [--statistics STATISTICS]
[--unit UNIT] [--ok_threshold OK_THRESHOLD] [--critical_threshold CRITICAL_THRESHOLD]
Arguments
-h, --help
Show this help message and exit

--targetgroup TARGETGROUP
Each target group is used to route requests to one or more registered targets. For example: targetgroup/target-group-name/numbers&characters

--loadbalancer LOADBALANCER
The load balancer distributes incoming application traffic across multiple targets. For example: app/application-load-balancer/numbers&characters

--period PERIOD
A period is the length of time associated with a specific Amazon CloudWatch statistic.
For example: to specify a period of 5 minutes, use 300 as the period value.

--statistics STATISTICS
Statistics are metric data aggregations over specified periods of time.
For example: Average

--unit UNIT
Each statistic has a unit of measure.
For example: Count

--ok_threshold OK_THRESHOLD
Threshold which reflects the OK status value. (Recommended threshold: 0)

--critical_threshold CRITICAL_THRESHOLD
Threshold which reflects the Critical status value. (Recommended threshold: 0)