Rust: Implement database quality telemetry query

shared/util/codeql/util/ReportStats.qll

@@ -0,0 +1,31 @@
+/**
+ * Provides the `ReportStats` module for reporting database quality statistics.
+ */
+module;
+
+signature module StatsSig {
+  int getNumberOfOk();
+
+  int getNumberOfNotOk();
+
+  string getOkText();
+
+  string getNotOkText();
+}
+
+module ReportStats<StatsSig Stats> {
+  predicate numberOfOk(string key, int value) {
+    value = Stats::getNumberOfOk() and
+    key = "Number of " + Stats::getOkText()
+  }
+
+  predicate numberOfNotOk(string key, int value) {
+    value = Stats::getNumberOfNotOk() and
+    key = "Number of " + Stats::getNotOkText()
+  }
+
+  predicate percentageOfOk(string key, float value) {
+    value = Stats::getNumberOfOk() * 100.0 / (Stats::getNumberOfOk() + Stats::getNumberOfNotOk()) and
+    key = "Percentage of " + Stats::getOkText()
+  }
+}