Update https://wikitech.wikimedia.org/wiki/Metrics_Platform/How_to/Create_a_Custom_Schema:
- Update example (T369687)
- Add details about choosing from an existing custom schema
- Add link to validate step
See also:
Notes:
- Common fragment: https://schema.wikimedia.org/#!/secondary/jsonschema/fragment/analytics/product_metrics/common
- All fragments: https://schema.wikimedia.org/#!/secondary/jsonschema/fragment/analytics/product_metrics
- The index of work-in-progress schema fragments on Metrics Platform/Analytics/Fragments don't seem to exist, and this content seems a few years old. These seem to be a different set of fragments. This page is referenced from https://wikitech.wikimedia.org/wiki/Event_Platform/Schemas/Guidelines#Common_analytics_fields