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Manual reader need to add Observability metric: #7009 . If the code under test calls meter.Float64Histogram(...), the call will be dispatched to the embedded mapi.Meter interface field, which is nil → runtime panic (nil interface method call). ``` go test -timeout 60s -race ./sdk/... ok go.opentelemetry.io/otel/sdk (cached) ? go.opentelemetry.io/otel/sdk/instrumentation [no test files] ok go.opentelemetry.io/otel/sdk/internal/x (cached) ok go.opentelemetry.io/otel/sdk/resource (cached) ok go.opentelemetry.io/otel/sdk/trace 1.995s ? go.opentelemetry.io/otel/sdk/trace/internal [no test files] ok go.opentelemetry.io/otel/sdk/trace/internal/env (cached) 2025/10/14 23:56:39 internal_logging.go:50: "msg"="Setting meter provider to its current value. No delegate will be configured" "error"="no delegate configured in meter provider" --- FAIL: TestBSPCallback (0.00s) panic: runtime error: invalid memory address or nil pointer dereference [recovered, repanicked] [signal SIGSEGV: segmentation violation code=0x2 addr=0x28 pc=0x1044c8c24] ``` **Resolution**: Add `Float64Histogram` to `errMeter` **Context**: https://github.com/open-telemetry/opentelemetry-go/pull/7500#discussion_r2431050902