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Merge pull request #9143 from gebn/ec2-sd

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Describe EC2 availability zone IDs at most once per refresh (#9142)
This commit is contained in:
Julien Pivotto 2021-08-04 01:16:05 +02:00 committed by GitHub
parent 0f8a9a4495 e6e7b08e6f
commit ba4911a482
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 20 additions and 21 deletions
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39
discovery/aws/ec2.go
View file

@ -194,24 +194,16 @@ func (d *EC2Discovery) ec2Client(ctx context.Context) (*ec2.EC2, error) {
return d.ec2, nil
}
func (d *EC2Discovery) azID(ctx context.Context, az string) (string, error) {
if azID, ok := d.azToAZID[az]; ok {
return azID, nil
}
func (d *EC2Discovery) refreshAZIDs(ctx context.Context) error {
azs, err := d.ec2.DescribeAvailabilityZonesWithContext(ctx, &ec2.DescribeAvailabilityZonesInput{})
if err != nil {
return "", errors.Wrap(err, "could not describe availability zones")
return err
}
d.azToAZID = make(map[string]string, len(azs.AvailabilityZones))
for _, az := range azs.AvailabilityZones {
d.azToAZID[*az.ZoneName] = *az.ZoneId
}
if azID, ok := d.azToAZID[az]; ok {
return azID, nil
}
return "", fmt.Errorf("no availability zone ID mapping found for %s", az)
return nil
}
func (d *EC2Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
@ -232,21 +224,23 @@ func (d *EC2Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error
})
}
input := &ec2.DescribeInstancesInput{Filters: filters}
// Only refresh the AZ ID map if we have never been able to build one.
// Prometheus requires a reload if AWS adds a new AZ to the region.
if d.azToAZID == nil {
if err := d.refreshAZIDs(ctx); err != nil {
level.Debug(d.logger).Log(
"msg", "Unable to describe availability zones",
"err", err)
}
}
input := &ec2.DescribeInstancesInput{Filters: filters}
if err := ec2Client.DescribeInstancesPagesWithContext(ctx, input, func(p *ec2.DescribeInstancesOutput, lastPage bool) bool {
for _, r := range p.Reservations {
for _, inst := range r.Instances {
if inst.PrivateIpAddress == nil {
continue
}
azID, err := d.azID(ctx, *inst.Placement.AvailabilityZone)
if err != nil {
level.Warn(d.logger).Log(
"msg", "Unable to determine availability zone ID",
"az", *inst.Placement.AvailabilityZone,
"err", err)
}
labels := model.LabelSet{
ec2LabelInstanceID: model.LabelValue(*inst.InstanceId),
@ -271,9 +265,14 @@ func (d *EC2Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error
labels[ec2LabelPublicIP] = model.LabelValue(*inst.PublicIpAddress)
labels[ec2LabelPublicDNS] = model.LabelValue(*inst.PublicDnsName)
}
labels[ec2LabelAMI] = model.LabelValue(*inst.ImageId)
labels[ec2LabelAZ] = model.LabelValue(*inst.Placement.AvailabilityZone)
azID, ok := d.azToAZID[*inst.Placement.AvailabilityZone]
if !ok && d.azToAZID != nil {
level.Debug(d.logger).Log(
"msg", "Availability zone ID not found",
"az", *inst.Placement.AvailabilityZone)
}
labels[ec2LabelAZID] = model.LabelValue(azID)
labels[ec2LabelInstanceState] = model.LabelValue(*inst.State.Name)
labels[ec2LabelInstanceType] = model.LabelValue(*inst.InstanceType)

2
docs/configuration/configuration.md
View file

@ -898,7 +898,7 @@ The following meta labels are available on targets during [relabeling](#relabel_
* `__meta_ec2_ami`: the EC2 Amazon Machine Image
* `__meta_ec2_architecture`: the architecture of the instance
* `__meta_ec2_availability_zone`: the availability zone in which the instance is running
* `__meta_ec2_availability_zone_id`: the [availability zone ID](https://docs.aws.amazon.com/ram/latest/userguide/working-with-az-ids.html) in which the instance is running
* `__meta_ec2_availability_zone_id`: the [availability zone ID](https://docs.aws.amazon.com/ram/latest/userguide/working-with-az-ids.html) in which the instance is running (requires `ec2:DescribeAvailabilityZones`)
* `__meta_ec2_instance_id`: the EC2 instance ID
* `__meta_ec2_instance_lifecycle`: the lifecycle of the EC2 instance, set only for 'spot' or 'scheduled' instances, absent otherwise
* `__meta_ec2_instance_state`: the state of the EC2 instance