observability

type Logger interface {
	Log(ctx context.Context, level slog.Level, msg string, args ...any)
}

type Metrics interface {
	ObserveRead(ctx context.Context, duration time.Duration, success bool, attrs map[string]string)
	ObserveMutation(ctx context.Context, duration time.Duration, success bool, attrs map[string]string)
	IncrementConflict(ctx context.Context, attrs map[string]string)
	IncrementReplay(ctx context.Context, attrs map[string]string)
	IncrementRetry(ctx context.Context, attrs map[string]string)
}

type NopLogger struct{}

type NopMetrics struct{}