message: Correct math on `exponential_buckets` invocation
diff: @@ -96,8 +96,8 @@ impl MemoryMetrics {
  "mem_estimator_runtime_s",
  "time taken to estimate memory usage, in seconds",
  )
  - // Create buckets from one nanosecond to four seconds.
  - .buckets(exponential_buckets(0.000_000_001, 2.0, 32)?),
  + // Create buckets from one nanosecond to eight seconds.
  + .buckets(exponential_buckets(0.000_000_004, 2.0, 32)?),
  )?;
  registry.register(Box::new(mem_total.clone()))?;
  