Add AZ / Availability Zone to ECS Metadata Env Vars

[johnjameswhitman]

Describe the question/issue

I was reading about the ability to add ECS task metadata to the FluentBit config (docs). We would like to annotate logs with the AvailabilityZone key from ECS Metadata V4, but it doesn't seem like that's included yet.

I believe it would be straightforward to add it to this struct and populate in the rest of the file:

aws-for-fluent-bit/init/fluent_bit_init_process.go

Lines 53 to 62 in 1c9e1fa

	type ECSTaskMetadata struct {
	AWS_REGION string `json:"AWSRegion"`
	ECS_CLUSTER string `json:"Cluster"` // Cluster name
	ECS_TASK_ARN string `json:"TaskARN"`
	ECS_TASK_ID string `json:"TaskID"`
	ECS_FAMILY string `json:"Family"`
	ECS_LAUNCH_TYPE string `json:"LaunchType"` // Task launch type will be an empty string if container agent is under version 1.45.0
	ECS_REVISION string `json:"Revision"` // Revision number
	ECS_TASK_DEFINITION string `json:"TaskDefinition"` // TaskDefinition = "family:revision"
	}

I would be happy to open a PR to add it in.

Related Issues

I couldn't find much on a quick search.