Add ELB support

[baweaver]

Added in reference to https://github.com/logstash-plugins/logstash-input-cloudwatch/issues/20 .

[jrgns]

@baweaver Looks good. Do you have a screenshot of the metrics coming through to confirm it works?

[baweaver]

I'll get that a little later today.

On Mon, Jun 26, 2017, 7:04 AM Jrgns notifications@github.com wrote:

@baweaver https://github.com/baweaver Looks good. Do you have a screenshot of the metrics coming through to confirm it works?

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[baweaver]

# agent configuration
input {
  cloudwatch {
    namespace => "AWS/ELB"
    metrics => ["HealthyHostCount"]
    region => "our-region"
  }
}

# Server logs:
[timestamp][INFO ][logstash.agent           ] Successfully started Logstash API endpoint {:port=>9600}
[timestamp][INFO ][logstash.inputs.cloudwatch] [AWS CloudWatch 200 2.241 0 retries] list_metrics(:namespace=>"AWS/ELB")  

[timestamp][INFO ][logstash.inputs.cloudwatch] Polling metric HealthyHostCount
[timestamp][INFO ][logstash.inputs.cloudwatch] Filters: []
[timestamp][INFO ][logstash.inputs.cloudwatch] [AWS ELB 200 5.357 0 retries] describe_load_balancers()  

[timestamp][INFO ][logstash.inputs.cloudwatch] Polling resource LoadBalancerName: our-loadbalancer-name
[timestamp][INFO ][logstash.inputs.cloudwatch] [AWS CloudWatch 200 0.769 0 retries] get_metric_statistics(:dimensions=>[{:name=>"LoadBalancerName",:value=>"our-loadbalancer-name"}],:end_time=>"timestamp",:metric_name=>"HealthyHostCount",:namespace=>"AWS/ELB",:period=>300,:start_time=>"timestamp",:statistics=>["SampleCount","Average","Minimum","Maximum","Sum"])

...

Need to remove filters from describe_load_balancers though. One sec on that one.