fix: Unify OTEL exporter diagnostics toggle and align headers

[abdulraqeeb33]

Summary

• centralize OTEL exporter diagnostic logging behind a single provider-level toggle (OTEL_EXPORTER_LOGGING_ENABLED surfaced as isOtelExporterLoggingEnabled) so all OTEL export paths use one source of truth
• add exporter-level diagnostics that log OTEL export lifecycle (request sent, success, failure) and enrich failures with parsed HTTP details (status, status message, and response body when available)
• keep OTEL transport compatible with current edge behavior by using the SDK header expected by the HTTP stack and explicitly validating that legacy blocked header variants are not sent
• normalize OTEL endpoint construction to .../sdk/log?app_id={appId} and add coverage to prevent regressions in path/query formatting
• remove redundant setAllAttributes(Attributes) extension in favor of the platform API/built-in method to reduce duplicated behavior and avoid extension shadowing noise
• expand OTEL tests to cover header shape and endpoint formation, alongside existing exporter/provider wiring checks

Test plan

• Run ./gradlew :OneSignal:otel:test
• Run ./gradlew :OneSignal:otel:compileDebugKotlin
• Verify branch diff against origin/main only includes OTEL/header and platform-provider toggle wiring changes

[github-actions]

📊 Diff Coverage Report

Diff Coverage Report (Changed Lines Only)

Threshold: 80%

Changed Files Coverage

• ❌ OtelPlatformProvider.kt: 0/1 changed lines (0.0%) (5 changed lines)
  • ⚠️ Below threshold: 1 uncovered changed lines
• ❌ OneSignalOpenTelemetry.kt: 0/8 changed lines (0.0%) (8 changed lines)
  • ⚠️ Below threshold: 8 uncovered changed lines
• ❌ OtelConfigRemoteOneSignal.kt: 0/43 changed lines (0.0%) (85 changed lines)
  • ⚠️ Below threshold: 43 uncovered changed lines

Overall Coverage (Changed Lines Only)

0/52 changed lines covered (0.0%)

❌ Coverage Check Failed

Files below 80% threshold:

• OtelPlatformProvider.kt: 0.0% (1 uncovered changed lines)

• OneSignalOpenTelemetry.kt: 0.0% (8 uncovered changed lines)

• OtelConfigRemoteOneSignal.kt: 0.0% (43 uncovered changed lines)

📥 View workflow run

[fadi-george]

how does isOtelExporterLoggingEnabled get set to true?

[abdulraqeeb33]

we set it manually whenever we want to debug in our local test env.

[nan-li]

we don't need app_id in header anymore because it's already captured elsewhere right

[abdulraqeeb33]

thats right