Documentation feedback: /docs/sources/tempo/configuration/_index.md - Cache allowed roles is missing options

[jordanbertasso]

The allowed roles listed in the cache documentation differ from the actual allowed roles

tempo/pkg/cache/cache.go

Lines 11 to 21 in efb11ea

	const (
	// individual roles
	RoleNone Role = "none"
	RoleBloom Role = "bloom"
	RoleTraceIDIdx Role = "trace-id-index"
	RoleParquetFooter Role = "parquet-footer"
	RoleParquetColumnIdx Role = "parquet-column-idx"
	RoleParquetOffsetIdx Role = "parquet-offset-idx"
	RoleFrontendSearch Role = "frontend-search"
	RoleParquetPage Role = "parquet-page"
	)

[joe-elliott]

parquet-column-idx and parquet-offset-idx are supposed to be undocumented. I didn't realize they were in the example.

These cache keys currently do nothing, b/c we don't use offset and column indexes in Parquet atm. We should remove them from the example.

[knylander-grafana]

I'll remove them from the documentation.

[knylander-grafana]

PR #3826