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Allow per language configuration prefixes #4891

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Merged
jack-berg merged 11 commits into from
Mar 1, 2026
Merged

Allow per language configuration prefixes #4891

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b20212e
allow per language configuration prefixes
MikeGoldsmith Feb 13, 2026
56c3841
add changelog entry
MikeGoldsmith Feb 13, 2026
b099d40
Merge branch 'main' of https://github.com/open-telemetry/opentelemetr…
MikeGoldsmith Feb 16, 2026
5857879
clean up after mege
MikeGoldsmith Feb 16, 2026
b934d1d
Merge branch 'main' of https://github.com/open-telemetry/opentelemetr…
MikeGoldsmith Feb 18, 2026
cc1e00c
Update ABNF, bullet list, and regex for language-specific substitutio…
MikeGoldsmith Feb 18, 2026
75e7350
Revise substitution grammar to be scheme-specific
MikeGoldsmith Feb 19, 2026
4aaffc2
Merge branch 'main' into mike/config-per-lang-prefixes
MikeGoldsmith Feb 19, 2026
6f159df
Remove INVALID-SUBSTITUTION-REF, revert GENERIC-SUBSTITUTION to *
MikeGoldsmith Feb 20, 2026
0db4a86
Merge branch 'main' of https://github.com/open-telemetry/opentelemetr…
MikeGoldsmith Feb 28, 2026
61f5a31
Stabilize optional Exception parameter to Logger Emit (#4886)
MikeGoldsmith Feb 28, 2026
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3 changes: 3 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -60,6 +60,9 @@ release.
`PluginComponentProvider`, `CreatePlugin` to `CreateComponent` in effort to
use consistent vocabulary
([#4806](https://github.com/open-telemetry/opentelemetry-specification/pull/4806))
- Declarative configuration: allow language-specific prefixes in environment
variable substitution.
([#4891](https://github.com/open-telemetry/opentelemetry-specification/pull/4891))

### Supplementary Guidelines

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9 changes: 9 additions & 0 deletions specification/configuration/data-model.md
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Expand Up @@ -88,6 +88,15 @@ DIGIT = %x30-39 ; 0-9
whitespace except `}`
* Must follow with `}`

Language implementations MAY support additional prefixes beyond `env:` to access
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jack-berg marked this conversation as resolved.
language-specific configuration sources (e.g., Java system properties). Such
prefixes MUST follow the same syntactic structure as `env:` (prefix followed by
colon). For example, Java implementations may support `sys:` to access system
properties: `${sys:otel.service.name}`. Language-specific prefixes enable
idiomatic configuration patterns while maintaining the universal `env:` prefix
for cross-language compatibility. Language implementations SHOULD document any
additional prefixes they support.

`INVALID-SUBSTITUTION-REF` defines an invalid environment variable substitution
reference:

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