Joseph Doherty
37fb84f477
feat(telemetry): core review fixes (Prometheus+OTLP coexistence, ServiceName validation, null guards) + contract overload note
- Fix #1: Prometheus exporter always wired for metrics; OTLP is additive overlay
when Exporter == ZbExporter.Otlp so /metrics + MapZbMetrics work in all modes.
- Fix #2: BuildOptions throws ArgumentException when ServiceName is null/whitespace.
- Fix #3: AddZbTelemetry(IHostApplicationBuilder) guard: ThrowIfNull(configure)
added alongside existing ThrowIfNull(builder).
- Fix #6: Contract doc adds IServiceCollection convenience overload signature.
- Tests: +3 new tests (OtlpExporter still serves /metrics, empty ServiceName throws,
whitespace ServiceName throws). Total: 7 passed (was 4).