Merge pull request #470 from nblumhardt/exponential-examples

Add a query example for exponentially bucketed histograms

Author: nblumhardt

src/SeqCli/Skills/Resources/working-with-seq-metrics/SKILL.md

@@ -96,7 +96,8 @@ HTTP request timing percentiles:
 select
   phist(coalesce((bucket.from + bucket.to) / 2, bucket.from, bucket.to), bucket.count, 95) as p95,
   phist(coalesce((bucket.from + bucket.to) / 2, bucket.from, bucket.to), bucket.count, 99) as p99
-from series lateral unnest(http.server.request.duration.buckets) as bucket 
+from series
+  lateral unnest(http.server.request.duration.buckets) as bucket 
 where Has(http.server.request.duration.buckets)
   and @Resource.service.name = 'cart'
   and @Scope.name = 'Microsoft.AspNetCore.Hosting'
@@ -131,6 +132,22 @@ group by time(1m)
 limit 100
 ```
 
+### `Exponential` Query Examples
+
+Commit timing percentiles:
+
+```
+select
+  phist(bucket.midpoint, bucket.count, 95) as p95,
+  phist(bucket.midpoint, bucket.count, 99) as p99
+from series
+  lateral unnest(commit_duration.buckets) as bucket 
+where Has(commit_duration.buckets)
+  and @Timestamp >= now() - 15m
+group by time(1m)
+limit 100
+```
+
 ## Gotchas
 
 - If metrics that should be _counters_ show up as _gauges_, aggregation temporality is likely to be misconfigured: danger! This can produce wildly inaccurate results if not detected.