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[Getting Started] Add reference app specification #6820

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@svrnm svrnm commented May 5, 2025

Contributes to the effort to rework our getting started guides

Signed-off-by: svrnm <sneumann@causely.ai>
@svrnm svrnm requested a review from a team as a code owner May 5, 2025 13:29
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@kaylareopelle kaylareopelle left a comment

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Great start! Thank you!

Co-authored-by: Kayla Reopelle <87386821+kaylareopelle@users.noreply.github.com>
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Took a quick copyedit first pass. Thanks!

svrnm and others added 3 commits June 5, 2025 10:37
Co-authored-by: Tiffany Hrabusa <30397949+tiffany76@users.noreply.github.com>
Signed-off-by: svrnm <sneumann@causely.ai>
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svrnm commented Jun 5, 2025

Apologies for the delay! I took some time today to incorporate your reviews and expand on the details, please take a look!

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One question, but otherwise LGTM.

svrnm and others added 2 commits June 18, 2025 11:01
Signed-off-by: svrnm <sneumann@causely.ai>
## General requirements

- Implementations of the Reference App are owned by language SIGs implementing
the OpenTelemetry APIs and SDKs.

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Listed in order of popularity, the most commonly used programming languages among OTel users are:

  1. JavaScript
  2. Java
  3. Go
  4. Python

Can we prioritize standardizing apps for these languages and consult their respective SIGs?

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nit:
Curious, where ca we get data about Otel language popularity etc.?

Going with just Github stars, Go, DotNet, JS, Java/Rust is the order.

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@LisaHJung LisaHJung Jun 30, 2025

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Hi @cijothomas ! The OTel End User SIG conducted a survey on the language popularity in addition to other helpful insights about the getting-started experience of the OTel users.

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We can prioritize them and make it a goal to have them as early as possible.

But eventually it comes down to the individuals who implement it :-)

Signed-off-by: svrnm <sneumann@causely.ai>
Comment on lines +63 to +69
- The code of the application must be split into two files:
- an `app` file that contains the handling of the HTTP requests
- a `library` file that contains the implementation of the roll dice function.
The names of those files should be idiomatic within the implementing
language, like `app.js` and `roll-the-dice.js`. The important point is that
by separating the two, the code demonstrates that the `library` only takes
dependency on the API and all the SDK code is initalized in the `app` code.
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@martincostello @cijothomas is this better, I picked a .js example but if you provide me with what a good naming for .NET is, I can update that accordingly.

Comment on lines +99 to +100
- There should be an option to enable diagnostic logging for the OpenTelemetry
components, if implemented ideally via `OTEL_LOG_LEVEL`.
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@cijothomas PTAL!

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6 participants