v15.0.0-canary.97

Core Changes

• Allow users to use process.env.NEXT_SSG_FETCH_METRICS to control fetch metrics during SSG: #68378
• refactor: replace indexOf === 0 with startsWith: #68116

Misc Changes

• docs: Improve PPR config/rendering sections: #68210

Credits

Huge thanks to @mknichel, @leerob, and @Juneezee for helping!