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discovery: aws: expose Primary IPv6 addresses as label, partially fixes #7406 (#14156)

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* discovery: aws: expose Primary IPv6 addresses as label

Add __meta_ec2_primary_ipv6_addresses label. This label contains the
Primary IPv6 address for every ENI attached to the EC2 instance. It is
ordered by the DeviceIndex and the missing elements (interface without
Primary IPv6 address) are kept in the list.

---------

Signed-off-by: Arpad Kunszt <akunszt@hiya.com>
Co-authored-by: Ayoub Mrini <ayoubmrini424@gmail.com>
This commit is contained in:
akunszt 2024-06-20 15:36:20 +02:00 committed by GitHub
parent c25d6d8ac6
commit 2aaf99dd0a
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GPG key ID: B5690EEEBB952194
2 changed files with 40 additions and 22 deletions
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17
discovery/aws/ec2.go
View file

@ -54,6 +54,7 @@ const (
ec2LabelInstanceType = ec2Label + "instance_type"
ec2LabelOwnerID = ec2Label + "owner_id"
ec2LabelPlatform = ec2Label + "platform"
ec2LabelPrimaryIPv6Addresses = ec2Label + "primary_ipv6_addresses"
ec2LabelPrimarySubnetID = ec2Label + "primary_subnet_id"
ec2LabelPrivateDNS = ec2Label + "private_dns_name"
ec2LabelPrivateIP = ec2Label + "private_ip"
@ -317,6 +318,7 @@ func (d *EC2Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error
var subnets []string
var ipv6addrs []string
var primaryipv6addrs []string
subnetsMap := make(map[string]struct{})
for _, eni := range inst.NetworkInterfaces {
if eni.SubnetId == nil {
@ -330,6 +332,15 @@ func (d *EC2Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error
for _, ipv6addr := range eni.Ipv6Addresses {
ipv6addrs = append(ipv6addrs, *ipv6addr.Ipv6Address)
if *ipv6addr.IsPrimaryIpv6 {
// we might have to extend the slice with more than one element
// that could leave empty strings in the list which is intentional
// to keep the position/device index information
for int64(len(primaryipv6addrs)) <= *eni.Attachment.DeviceIndex {
primaryipv6addrs = append(primaryipv6addrs, "")
}
primaryipv6addrs[*eni.Attachment.DeviceIndex] = *ipv6addr.Ipv6Address
}
}
}
labels[ec2LabelSubnetID] = model.LabelValue(
@ -342,6 +353,12 @@ func (d *EC2Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error
strings.Join(ipv6addrs, ec2LabelSeparator) +
ec2LabelSeparator)
}
if len(primaryipv6addrs) > 0 {
labels[ec2LabelPrimaryIPv6Addresses] = model.LabelValue(
ec2LabelSeparator +
strings.Join(primaryipv6addrs, ec2LabelSeparator) +
ec2LabelSeparator)
}
}
for _, t := range inst.Tags {

1
docs/configuration/configuration.md
View file

@ -1229,6 +1229,7 @@ The following meta labels are available on targets during [relabeling](#relabel_
* `__meta_ec2_ipv6_addresses`: comma separated list of IPv6 addresses assigned to the instance's network interfaces, if present
* `__meta_ec2_owner_id`: the ID of the AWS account that owns the EC2 instance
* `__meta_ec2_platform`: the Operating System platform, set to 'windows' on Windows servers, absent otherwise
* `__meta_ec2_primary_ipv6_addresses`: comma separated list of the Primary IPv6 addresses of the instance, if present. The list is ordered based on the position of each corresponding network interface in the attachment order.
* `__meta_ec2_primary_subnet_id`: the subnet ID of the primary network interface, if available
* `__meta_ec2_private_dns_name`: the private DNS name of the instance, if available
* `__meta_ec2_private_ip`: the private IP address of the instance, if present