feat: add more percentiles to histogram stats (#99)

Add p1, p5 and p99 to all fields where we are collecting percentile
values.

Signed-off-by: Miroslav Bajtoš <oss@bajtos.net>

lib/retrieval-stats.js

@@ -99,7 +99,7 @@ const addHistogramToPoint = (point, values, fieldNamePrefix = '') => {
   point.intField(`${fieldNamePrefix}min`, values[0])
   point.intField(`${fieldNamePrefix}mean`, values.reduce((sum, v) => sum + BigInt(v), 0n) / BigInt(count))
   point.intField(`${fieldNamePrefix}max`, values[count - 1])
-  for (const p of [10, 50, 90, 95]) {
+  for (const p of [1, 5, 10, 50, 90, 95, 99]) {
     point.intField(`${fieldNamePrefix}p${p}`, getValueAtPercentile(values, p))
   }
 }