Give operators a V2 setting (channel_monitor_hide_user_ranking) to hide
the user ranking tab and the /users payload from non-admin channel
monitor v2 viewers. Default false (ranking stays visible). Admin
endpoints and views always keep the ranking.
Also stop painting first-token '-' as a red/empty failure when traffic
is sync-only and has no first-token samples: a missing TTFT is
"not applicable" (health-unknown), not a breached latency budget.
Changes:
- new setting key + fail-open parse (only literal "true" hides), wired
through public/admin settings DTOs, handlers, and the V2 runtime
- ChannelMonitorV2Service.Users returns an empty list to non-admin
viewers when the toggle is on
- frontend: feature flag + SettingsView toggle + user V2 view hides the
ranking tab and skips the /users call
- monitorFormat: isTtftUnavailable/ttftDisplayState keep missing TTFT
neutral
Tests:
- setting parse defaults to visible and only literal "true" hides
- V2 Users honors the toggle for non-admin viewers
- frontend MetricCell/monitorFormat keep missing TTFT neutral
TT
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