Update Documentation for Internal Metric Naming Conventions

[Tharanishwaran]

This PR updates the documentation to clarify the internal metric naming conventions for the OpenTelemetry Collector.

Changes:
Added a note to explain:
1.Starting from v0.106.1: Metrics from Collector components are prefixed with otelcol_, while metrics from
instrumentation libraries are not prefixed.

          2.Versions before v0.106.1: All internal metrics, regardless of their source, had the otelcol_ prefix.

This update ensures that users understand the changes in metric naming conventions across different versions of the Collector.

Related Issue:
Fixes #4933

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Tharanishwaran / name: Tharanishwaran (80ff2a7, 35d7fb7, 8f15a37, 63096b7, a3bf758, ad9c37a, f4155a0, f0b7f0a, d6c5b04, 3fb40d4)
• ✅ login: tiffany76 / name: Tiffany Hrabusa (0b98264)
• ✅ login: opentelemetrybot / name: OpenTelemetry Bot (6e4940d, a042f41)

[tiffany76]

Great job! I added short code formatting for the call-out to match others on the page.

I also think this note would be better placed further down where the list of metrics occurs. Right about line 189 should do it.

[Tharanishwaran]

Hi @tiffany76,
I have realized that some unintended commits were included in this pull request. I apologize for the oversight and any inconvenience this may have caused. I will address this issue promptly by removing the extraneous commits and ensuring that only the intended changes remain.

[tiffany76]

/fix:format

[opentelemetrybot]

You triggered fix:format action run at https://github.com/open-telemetry/opentelemetry.io/actions/runs/10819988623

[opentelemetrybot]

fix:format was successful.

IMPORTANT: (RE-)RUN /fix:all to ensure that there are no remaining check issues.

[tiffany76]

LGTM, @Tharanishwaran! Thanks for your contribution.

@open-telemetry/collector-approvers, PTAL.

[codeboten]

Thanks @Tharanishwaran! Added a note, the prefix was not applied to internal metrics emitted via OTLP

[Tharanishwaran]

Many thanks to @tiffany76, @codeboten for your useful comments and taking the time to review the changes. I am glad that the checks passed and the PR finally got approval. If possible, one of the maintainers kindly goes ahead and merges the PR. Truly I appreciate the time and your support

[songy23]

Thank you @Tharanishwaran for calling it out, we have run into the same issue in 0.106 & 0.107

[Tharanishwaran]

Thank you @songy23 for your comment I’ve implemented the suggested change regarding the otelcol_ prefix

[tiffany76]

One tiny change.

[tiffany76]

/fix:format

[opentelemetrybot]

You triggered fix:format action run at https://github.com/open-telemetry/opentelemetry.io/actions/runs/10838462302

[opentelemetrybot]

fix:format was successful.

IMPORTANT: (RE-)RUN /fix:all to ensure that there are no remaining check issues.

[Tharanishwaran]

/fix:all

[opentelemetrybot]

You triggered fix:all action run at https://github.com/open-telemetry/opentelemetry.io/actions/runs/10842811641

[opentelemetrybot]

fix:all was successful.

IMPORTANT: (RE-)RUN /fix:all to ensure that there are no remaining check issues.