diff --git a/unified/ql/lib/codeql/unified/internal/AnalysisQuality.qll b/unified/ql/lib/codeql/unified/internal/AnalysisQuality.qll
index 0553ecc3d858..9a14dfd79d99 100644
--- a/unified/ql/lib/codeql/unified/internal/AnalysisQuality.qll
+++ b/unified/ql/lib/codeql/unified/internal/AnalysisQuality.qll
@@ -4,6 +4,8 @@ private import codeql.unified.internal.NameBinding
 private import codeql.unified.internal.dataflow.DataFlowCall
 private import codeql.unified.internal.dataflow.DataFlowCallable
 private import codeql.unified.internal.dataflow.CallGraph
+private import codeql.unified.internal.typeinference.Type as Type
+private import codeql.unified.internal.typeinference.TypeMention
 
 /** Stats about name nodes that static name binding could resolve. */
 module StaticNameResolutionStats implements EntityStatsSig {
@@ -109,6 +111,18 @@ module CallGraphStats implements EntityStatsSig {
 
 module CallGraphStatsReport = EntityReportStats<CallGraphStats>;
 
+module TypeMentionStats implements EntityStatsSig {
+  class Candidate extends ExprTypeMention {
+    predicate isOk() { this.getType() = any(Type::Type t | not t instanceof Type::UnknownType) }
+  }
+
+  string getOkText() { result = "resolvable type mentions" }
+
+  string getNotOkText() { result = "unresolvable type mentions" }
+}
+
+module TypeMentionStatsReport = EntityReportStats<TypeMentionStats>;
+
 /**
  * Gets summary statistics about taint.
  */
diff --git a/unified/ql/lib/codeql/unified/internal/typeinference/TypeMention.qll b/unified/ql/lib/codeql/unified/internal/typeinference/TypeMention.qll
index 2b670c0d2fc9..99d12990044b 100644
--- a/unified/ql/lib/codeql/unified/internal/typeinference/TypeMention.qll
+++ b/unified/ql/lib/codeql/unified/internal/typeinference/TypeMention.qll
@@ -5,8 +5,10 @@ private import TypeInferencePlugin as Plugin
 private import codeql.unified.internal.StaticNameBinding
 private import codeql.unified.internal.ExprPositions
 
+final class TypeMention = TypeMentionImpl;
+
 /** An AST node that mentions a type. */
-abstract class TypeMention extends AstNode {
+abstract private class TypeMentionImpl extends AstNode {
   /**
    * Gets the type mentioned at `path`.
    */
@@ -27,8 +29,10 @@ private Type resolveType(Identifier access) {
   )
 }
 
-abstract private class ExprTypeMention extends TypeMention, Expr {
-  ExprTypeMention() { isInTypeContext(this) }
+final class ExprTypeMention = ExprTypeMentionImpl;
+
+abstract private class ExprTypeMentionImpl extends TypeMentionImpl, Expr {
+  ExprTypeMentionImpl() { isInTypeContext(this) }
 
   pragma[nomagic]
   abstract TypePath getTypeArgumentPath(int i);
@@ -37,7 +41,7 @@ abstract private class ExprTypeMention extends TypeMention, Expr {
 /**
  * A type mention that resolves via an alias (aliases are expanded).
  */
-private class AliasExprTypeMention extends ExprTypeMention {
+private class AliasExprTypeMention extends ExprTypeMentionImpl {
   private TypeAliasDeclaration alias;
 
   AliasExprTypeMention() { alias.getNameNode() = getStaticBindingTargetFromRef(this) }
@@ -62,7 +66,7 @@ private class AliasExprTypeMention extends ExprTypeMention {
 /**
  * A type mention that does not resolve via an alias.
  */
-private class NonAliasExprTypeMention extends ExprTypeMention {
+private class NonAliasExprTypeMention extends ExprTypeMentionImpl {
   NonAliasExprTypeMention() { not this instanceof AliasExprTypeMention }
 
   private Type getRootType0() {
@@ -141,7 +145,7 @@ private class NonAliasExprTypeMention extends ExprTypeMention {
   }
 }
 
-private class GenericTypeExprTypeMention extends TypeMention, GenericTypeExpr {
+private class GenericTypeExprTypeMention extends TypeMentionImpl, GenericTypeExpr {
   private ExprTypeMention base;
 
   GenericTypeExprTypeMention() { base = this.getBase() }
@@ -163,7 +167,7 @@ private class GenericTypeExprTypeMention extends TypeMention, GenericTypeExpr {
 }
 
 /** A class declaration mentions itself. */
-private class ClassLikeDeclarationTypeMention extends TypeMention, Identifier {
+private class ClassLikeDeclarationTypeMention extends TypeMentionImpl, Identifier {
   private ClassLikeDeclaration c;
 
   ClassLikeDeclarationTypeMention() { this = c.getNameNode() }
diff --git a/unified/ql/src/diagnostic/ExtractorInformation.ql b/unified/ql/src/diagnostic/ExtractorInformation.ql
index 3fc0634b3344..ddf225db6fd8 100644
--- a/unified/ql/src/diagnostic/ExtractorInformation.ql
+++ b/unified/ql/src/diagnostic/ExtractorInformation.ql
@@ -42,7 +42,8 @@ where
     numberOfLinesOfCodeByExtension(key, value) or
     StaticNameResolutionStatsReport::keyValuePair(key, value) or
     FilesCoveredByModuleManifestStatsReport::keyValuePair(key, value) or
-    CallGraphStatsReport::keyValuePair(key, value)
+    CallGraphStatsReport::keyValuePair(key, value) or
+    TypeMentionStatsReport::keyValuePair(key, value)
   ) and
   /* Infinity */
   value != 1.0 / 0.0 and