Without search engines indexing the world wide web, everything online would have evolved much differently.

All site discovery, would involve isolated webs, and sharing within communities about other groups of information.

This is why embracing search and indexing is so important; and as is, with organic web community and informations generation, without traditional search capabilities.

For a typical scale up, the metrics related, can be boiled down to one metric.

This may be different than a typical analytic, or not.

Rest assured, when you make it this far, as far as refinement goes, your scale up is probably in a good position metrically speaking.