no metrics for functions without examples

Author: Zylphrex

CHANGELOG.md

@@ -35,7 +35,7 @@
 - Add default non-root user in the Docker image. ([#593](https://github.com/getsentry/vroom/pull/593))
 - Classify macOS frames from an application as application frames. ([#604](https://github.com/getsentry/vroom/pull/604))
 - Return number of occurrences in flamegraph. ([#622](https://github.com/getsentry/vroom/pull/622), [#625](https://github.com/getsentry/vroom/pull/625))
-- Use function duration when computing metrics ([#627](https://github.com/getsentry/vroom/pull/627), [#628](https://github.com/getsentry/vroom/pull/628), [#629](https://github.com/getsentry/vroom/pull/629), [#630](https://github.com/getsentry/vroom/pull/630), [#635](https://github.com/getsentry/vroom/pull/635))
+- Use function duration when computing metrics ([#627](https://github.com/getsentry/vroom/pull/627), [#628](https://github.com/getsentry/vroom/pull/628), [#629](https://github.com/getsentry/vroom/pull/629), [#630](https://github.com/getsentry/vroom/pull/630), [#635](https://github.com/getsentry/vroom/pull/635), [#638](https://github.com/getsentry/vroom/pull/638))
 - Remove Unused metrics endpoint ([#633](https://github.com/getsentry/vroom/pull/633))
 
 **Bug Fixes**:

internal/metrics/metrics.go

@@ -143,7 +143,7 @@ func (a *Aggregator) AddFunction(n *nodetree.Node, depth int) {
 	}
 
 	for example := range n.Profiles {
-		if len(function.Examples) < a.maxUniqueFunctions {
+		if len(function.Examples) < a.maxNumberOfExamples {
 			function.Examples = append(function.Examples, example)
 		}
 	}
@@ -165,6 +165,11 @@ func (a Aggregator) ToMetrics() []examples.FunctionMetrics {
 		if f.SumSelfTimeNS <= 0 {
 			continue
 		}
+
+		if len(f.Examples) <= 0 {
+			continue
+		}
+
 		sort.Slice(f.Examples, func(i, j int) bool {
 			example1 := f.Examples[i]
 			example2 := f.Examples[j]