virtual std::vector< std::shared_ptr<Snapshot> > snapshots() const = 0;
virtual void clear() = 0;
virtual uint64_t get_max_sample_count() const = 0;
virtual std::vector< std::shared_ptr<Snapshot> > snapshots() const = 0;
virtual void clear() = 0;
virtual uint64_t get_max_sample_count() const = 0;