pub fn start(
t: &'static Telemetry,
cfg: &TelemetryConfig,
) -> Result<Option<SamplerHandle>, String>Expand description
2026-09-26: Configure t and, for a level that samples, start the NVML
sampler.
Ok(None) when the level is Off: nothing is started or allocated.
Err(reason) when the device cannot be read (NVML missing, no such
device, no thread): t is marked unavailable with the reason, which is
also returned.