<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
This PR adds a guideline about how metrics'/attributes' addition should
take place in (some) coordination with the Semantic Conventions project.
This addition does not introduce a hard requirement for now but rather
suggests how such coordination with Semantic Conventions can be
achieved.
If this gets merged I plan to extend Contrib's guidelines as well (i.e.
84f1030339/CONTRIBUTING.md (adding-metrics-to-existing-receivers))
to link back to this guideline.
<!-- Issue number if applicable -->
#### Link to tracking issue
Part of
https://github.com/open-telemetry/opentelemetry-collector/issues/13076
/cc @open-telemetry/collector-contrib-approvers
@open-telemetry/collector-approvers
Note: It's still to be defined how Semantic Conventions will affect
components' stability as described at
https://github.com/open-telemetry/opentelemetry-collector/issues/11878,
however prior to the stability concern this PR suggests to update our
contribution guidelines to cover for this treating it as a "soft"
requirement already.
---------
Signed-off-by: ChrsMark <chrismarkou92@gmail.com>
#### Description
A very minor whitespace issue was preventing the list from formatting
correctly on one .md doc page. This fixes that _very minor_ issue.
Co-authored-by: Alex Boten <223565+codeboten@users.noreply.github.com>
Trying to reference docs on internal metrics and found the current link
sends you to `404 - page not found` since the page seems to have moved
from `opentelemetry-collector-contrib` to `opentelemetry-collector` repo
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
<!-- Issue number if applicable -->
#### Link to tracking issue
Fixes #
<!--Describe what testing was performed and which tests were added.-->
#### Testing
<!--Describe the documentation added.-->
#### Documentation
<!--Please delete paragraphs that you did not use before submitting.-->
Co-authored-by: Bogdan Drutu <bogdandrutu@gmail.com>
Christos Markou