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metrics: Increase the resolution of histogram metrics (#7335)
* metrics: Increase the resolution of histogram metrics These metrics are using the default histogram buckets: ``` pub const DEFAULT_BUCKETS: &[f64; 11] = &[ 0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0, ]; ``` Which give us a resolution of 5ms, that's good, but there are some subsystems where we process hundreds or even a few thousands of messages per second like approval-voting or approval-distribution, so it makes sense to increse the resoution of the bucket to better understand if the procesisng is in the range of useconds. The new bucket ranges will be: ``` [0.0001, 0.0004, 0.0016, 0.0064, 0.0256, 0.1024, 0.4096, 1.6384, 6.5536] ``` Signed-off-by: Alexandru Gheorghe <alexandru.gheorghe@parity.io> * Use buckets with higher resolution Signed-off-by: Alexandru Gheorghe <alexandru.gheorghe@parity.io> --------- Signed-off-by: Alexandru Gheorghe <alexandru.gheorghe@parity.io>
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