[MetricBeat] support wildcard * dimension value in AWS CloudWatch module

[kwinstonix]

• Enhancement

What does this PR do?

• support wildcard * dimension value in AWS CloudWatch metrics config
• update document with example config

Why is it important?

Now we must set explicit dimension value to filter out CloudWatch metrics. It will be flexible if we can support wildcard * in value param.

current config example:

- module: aws
  period: 300s
  metricsets:
    - cloudwatch
  metrics:
    - namespace: AWS/ApplicationELB
      statistic: ['Maximum']
      name: ['UnHealthyHostCount']
      dimensions:
        - name: LoadBalancer
          value: "lb id"
        - name: TargetGroup
          value: "tg id"

with the enhancement:

- module: aws
  period: 300s
  metricsets:
    - cloudwatch
  metrics:
    - namespace: AWS/ApplicationELB
      statistic: ['Maximum']
      name: ['UnHealthyHostCount']
      dimensions:
        - name: LoadBalancer
          value: "*"
        - name: TargetGroup
          value: "*"

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Related issues

• Closes [MetricBeat] AWS module support wildcard format dimension value to reduce the metrics count  #18050

[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[elasticmachine]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request #19660 updated]

• Start Time: 2020-07-07T15:12:32.489+0000

• Duration: 46 min 43 sec

Test stats 🧪

Test	Results
Failed	0
Passed	729
Skipped	72
Total	801

Steps errors

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• Name: Check out from version control

  • Description: [2020-07-07T15:14:14.724Z] using credential f6c7695a-671e-4f4f-a331-acdce44ff9ba
    [2020-07-07T15:14:

  • Duration: 2 min 13 sec

  • Start Time: 2020-07-07T15:14:12.141+0000

  • log

[elasticmachine]

Pinging @elastic/integrations-platforms (Team:Platforms)

[kaiyan-sheng]

Tested and it works! Just one nit about adding a unit test for configDimensionValueContainsWildcard function. Thank you for the contribution!!

[kaiyan-sheng]

jenkins run tests please

[kwinstonix]

Ok, I will add that unit test, thank you

[kaiyan-sheng]

jenkins run the tests

[kwinstonix]

jenkins run the tests

[kaiyan-sheng]

@kwinstonix Thank you! I just resolved the merge conflict and once the CI gives a green, I will merge this PR and backport it. Thanks again for your contribution!!