Merge pull request #563 from dominikschulz/ec2state

Add ec2_instance_state

content/docs/operating/configuration.md

@@ -352,6 +352,7 @@ The following meta labels are available on targets during relabeling:
 
 * `__meta_ec2_availability_zone`: the availability zone in which the instance is running
 * `__meta_ec2_instance_id`: the EC2 instance ID
+* `__meta_ec2_instance_state`: the state of the EC2 instance
 * `__meta_ec2_private_ip`: the private IP address of the instance, if present
 * `__meta_ec2_public_dns_name`: the public DNS name of the instance, if available
 * `__meta_ec2_public_ip`: the public IP address of the instance, if available