$ go test -v -run TestRequestPriority
=== RUN   TestRequestPriority
=== RUN   TestRequestPriority/use_default_MEDIUM_priority
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x28 pc=0x10316ef04]

goroutine 94 [running]:
cloud.google.com/go/spanner.(*builtinMetricsTracer).toOtelMetricAttrs(0x14000384090, {0x1032c539b, 0xf})
        /Users/apstndb/go/pkg/mod/cloud.google.com/go/spanner@v1.71.0/metrics.go:424 +0x3f4
cloud.google.com/go/spanner.recordOperationCompletion(0x14000384090)
        /Users/apstndb/go/pkg/mod/cloud.google.com/go/spanner@v1.71.0/metrics.go:490 +0x58
cloud.google.com/go/spanner.(*grpcSpannerClient).BatchCreateSessions(0x1400058a870, {0x1038a1980, 0x14000414d80}, 0x14000470000, {0x1400038a0c0, 0x1, 0x1})
        /Users/apstndb/go/pkg/mod/cloud.google.com/go/spanner@v1.71.0/grpc_client.go:134 +0x1c4
cloud.google.com/go/spanner.(*sessionClient).executeBatchCreateSessions(0x14000528160, {0x1038ae1b8, 0x1400058a870}, 0x1, 0x14000584690, 0x140005846c0, {0x10389aed8, 0x14000270200})
        /Users/apstndb/go/pkg/mod/cloud.google.com/go/spanner@v1.71.0/sessionclient.go:277 +0x430
created by cloud.google.com/go/spanner.(*sessionClient).batchCreateSessions in goroutine 50
        /Users/apstndb/go/pkg/mod/cloud.google.com/go/spanner@v1.71.0/sessionclient.go:243 +0x2f8
exit status 2
FAIL    github.com/cloudspannerecosystem/spanner-cli    0.492s