C++: Limit metrics to top 500

Author: calumgrant

cpp/ql/src/Telemetry/CompilerErrors.ql

@@ -9,4 +9,5 @@
 import Metrics
 
 from CppMetrics::ErrorCount m
+where RankMetric<CppMetrics::ErrorCount>::getRank(m) <= 500
 select m.toString(), m.getValue()

cpp/ql/src/Telemetry/Metrics.qll

@@ -60,6 +60,14 @@ class QualityMetric extends Metric {
   }
 }
 
+signature class RankedMetric extends Metric {
+  int getValue();
+}
+
+module RankMetric<RankedMetric M> {
+  int getRank(M s) { s = rank[result](M m | | m order by m.getValue() desc) }
+}
+
 /** Various metrics we want to report. */
 module CppMetrics {
   class CompilationUnits extends BaseMetric {

cpp/ql/src/Telemetry/MissingIncludes.ql

@@ -9,4 +9,5 @@
 import Metrics
 
 from CppMetrics::MissingIncludeCount e
+where RankMetric<CppMetrics::MissingIncludeCount>::getRank(e) <= 500
 select e.getIncludeText(), e.getValue()

cpp/ql/src/Telemetry/SucceededIncludes.ql

@@ -9,4 +9,5 @@
 import Metrics
 
 from CppMetrics::SucceededIncludeCount m
+where RankMetric<CppMetrics::SucceededIncludeCount>::getRank(m) <= 500
 select m.getIncludeText(), m.getValue()