make rb/meta/taint-steps into a @kind problem query

Author: erik-krogh

ruby/ql/src/queries/meta/TaintSteps.ql

@@ -1,11 +1,11 @@
 /**
  * @name Taint steps
- * @description The number of default taint steps.
- * @kind metric
- * @metricType project
- * @metricAggregate sum
- * @tags meta
+ * @description All taint steps.
+ * @kind problem
+ * @problem.severity recommendation
  * @id rb/meta/taint-steps
+ * @tags meta
+ * @precision very-low
  */
 
 import ruby
@@ -14,4 +14,8 @@ import codeql.ruby.dataflow.internal.TaintTrackingPublic
 
 predicate relevantStep(DataFlow::Node pred, DataFlow::Node succ) { localTaintStep(pred, succ) }
 
-select projectRoot(), count(DataFlow::Node pred, DataFlow::Node succ | relevantStep(pred, succ))
+from DataFlow::Node pred, int numOfSuccessors
+where
+  relevantStep(pred, _) and
+  numOfSuccessors = count(DataFlow::Node succ | relevantStep(pred, succ))
+select pred, "Step to " + numOfSuccessors + " other nodes."