Set environment (production/staging/...)

According to https://opentelemetry.io/docs/specs/otel/resource/sdk/#specifying-resour..., that should be something like OTEL_RESOURCE_ATTRIBUTES=deployment.environment.name=staging (With SigNoz, it's just OTEL_RESOURCE_ATTRIBUTES=deployment.environment=staging)

That seems to work, but I'd like to derive this environment variable from other environment variables (using platform.sh environment variables such as PLATFORM_ENVIRONMENT_TYPE), and possibly still support some additional variables, so I'd need to read, merge, extend and then re-expose this, would be nice if there would be an easier extension point in Drupal itself.

Thoughts?

Actually OTEL provides a lot of variables to control the behavior, but implementing support for all of them will overcomplicate the module, so I think it's better to use them directly.

If you need to perform some modifications in them, you can do this in the settings.php file, something like this:

$envType = getenv('PLATFORM_ENVIRONMENT_TYPE');
putenv("OTEL_RESOURCE_ATTRIBUTES=deployment.environment.name=$envType");

Yes, this is what I do now:

// Automatically set the environment for OpenTelemetry if not already set.
$otel_resource_attributes = getenv('OTEL_RESOURCE_ATTRIBUTES') ?? '';
if (!str_contains($otel_resource_attributes, 'deployment.environment')) {
  if ($otel_resource_attributes) {
    $otel_resource_attributes .= ',';
  }
  $otel_resource_attributes .= 'deployment.environment=';
  if (getenv('PLATFORM_ENVIRONMENT_TYPE') == 'production') {
    $otel_resource_attributes .= 'production';
  }
  elseif ($platformsh->inRuntime()) {
    $otel_resource_attributes .= $platformsh->branch;
  }
  else {
    $otel_resource_attributes .= 'development';
  }
  putenv('OTEL_RESOURCE_ATTRIBUTES=' . $otel_resource_attributes);
}

It's fairly complex, but managable.