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Cw emf exporter #3

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Description:
Add EMF exporter to support exporting metrics to CloudWatch through embedded metric filter.

Testing:
Unit tests
End to end tests are done in CWAgent-6548

Notes:
I have synced with upstream on my source local master branch. However, I realize this target master branch doesn't pull the latest change from upstream. Maybe we should sync with upstream first. Otherwise, there are too many upstream changes and I cannot create PR with my master branch. This PR is currently created based on my cw_emf_exporter branch

mxiamxia pushed a commit that referenced this pull request Oct 7, 2020
* Add DataDog exporter back from old fork
commit 99129fb96e29e9c1a92da00b7e3f8efcae8a31e8
Author: Pablo Baeyens <pablo.baeyens@datadoghq.com>
Date:   Thu Sep 3 18:10:28 2020 +0200

    Handle namespace at initialization time

commit babca25927926a60c0c416294af3aadf784d41b9
Author: Pablo Baeyens <pablo.baeyens@datadoghq.com>
Date:   Thu Sep 3 17:23:53 2020 +0200

    Initialize on a separate function
    This way the variables can be checked without worrying about the env

commit 24d0cb4cc566fa5313a8650c904a27bea68bf555
Author: Pablo Baeyens <pablo.baeyens@datadoghq.com>
Date:   Thu Sep 3 14:30:35 2020 +0200

    Check environment variables for unified service tagging

commit 6695f8297ab8b1fcae71b05acb027c4a0992e3a0
Author: Pablo Baeyens <pablo.baeyens@datadoghq.com>
Date:   Wed Sep 2 14:57:37 2020 +0200

    Add support for sending metrics through the API
    - Use datadog.Metric type for simplicity
    - Get host if unset

commit c366603
Author: Pablo Baeyens <pablo.baeyens@datadoghq.com>
Date:   Wed Sep 2 09:56:24 2020 +0200

    Disable Queue and Retry settings (#72)

    These are handled by the statsd package.
    OpenTelemetry docs are confusing and the default configuration (disabled)
    is different from the one returned by "GetDefault..." functions

commit a660b56
Author: Pablo Baeyens <pablo.baeyens@datadoghq.com>
Date:   Tue Sep 1 15:26:14 2020 +0200

    Add support for summary and distribution metric types (#65)

    * Add support for summary metric type

    * Add support for distribution metrics

    * Refactor metrics construction
    - Drop name in Metrics (now they act as Metric values)
    - Refactor constructor so that errors happen at compile-time

    * Report Summary total sum and count values
    Snapshot values are not filled in by OpenTelemetry

    * Report p00 and p100 as `.min` and `.max`
    This is more similar to what we do for our own non-additive type

    * Keep hostname if it has not been overridden

commit c95adc4
Author: Pablo Baeyens <pablo.baeyens@datadoghq.com>
Date:   Thu Aug 27 13:00:02 2020 +0200

    Update dependencies and `make gofmt`
    The collector was updated to 0.9.0 upstream

commit 20afb0e
Author: Pablo Baeyens <pablo.baeyens@datadoghq.com>
Date:   Wed Aug 26 18:25:49 2020 +0200

    Refactor configuration (#45)

    * Refactor configuration
    * Implement telemetry and tags configuration handling
    * Update example configuration and README file
    Co-authored-by: Kylian Serrania <kylian.serrania@datadoghq.com>

commit fdc98b5
Author: Pablo Baeyens <pablo.baeyens@datadoghq.com>
Date:   Fri Aug 21 11:09:08 2020 +0200

    Initial DogStatsD implementation (#15)

    Initial metrics exporter through DogStatsD with support for all metric types but summary and distribution

commit e848a60
Author: Pablo Baeyens <pablo.baeyens@datadoghq.com>
Date:   Fri Aug 21 10:42:45 2020 +0200

    Bump collector version

commit 58be9a4
Author: Pablo Baeyens <pablo.baeyens@datadoghq.com>
Date:   Thu Aug 6 10:04:32 2020 +0200

    Address linter

commit 695430c
Author: Pablo Baeyens <pablo.baeyens@datadoghq.com>
Date:   Tue Aug 4 13:28:01 2020 +0200

    Fix field name error

    MetricsEndpoint was renamed to MetricsURL

commit 168b319
Author: Pablo Baeyens <pablo.baeyens@datadoghq.com>
Date:   Mon Aug 3 11:05:01 2020 +0200

    Create initial outline for Datadog exporter (#1)

    * Add support for basic configuration options
    * Documents configuration options

* go mod tidy

* Address feedback from upstream PR we did not merge (#1)

* Backport changes from upstream PR

Remove `err` from MapMetrics

* Remove usage of pdatautil

* Fix tests

* Use TCPAddr

* Review which functions should be private

* Remove DogStatsD mode (#2)

* Remove DogStatsD mode

* go mod tidy

* Remove mentions to DogStatSD

* Improve test coverage (#3)

* Improve test coverage

Added unit tests for
- API key censoring
- Hostname
- Metrics exporter

Renamed test and implementation files for consistency

* Add one additional test

* Remove client validation (#6)

The zorkian API does not validate the API key unless you also have
an application key, even though the endpoint works without it.

I am removing this validation until this gets fixed on the zorkian library

* Keep only configuration and factory methods

Following the contribution guidelines we need to make a first PR
with this

* Use latest version of collector

* Remove `report_percentiles` option
It is not being used as of now until the OTLP metrics format
stabilizes and we have a Summary type metric again

* Correct configuration

The API key is now a required setting

* Remove test not relevant for this PR

* Remove unnecessary imports after removing test

* Address review comment

* Apply suggestions from code review

Co-authored-by: Tigran Najaryan <4194920+tigrannajaryan@users.noreply.github.com>

* Separate documentation into two examples
One example with the minimal configuration, for sending to `datadoghq.com`
and a second one for sending to `datadoghq.eu`

Co-authored-by: Tigran Najaryan <4194920+tigrannajaryan@users.noreply.github.com>
mxiamxia pushed a commit that referenced this pull request Oct 2, 2023
… name (#3)

* Add option to override cluster name
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