Add special warning for the new feature

Author: optionsome

application/src/main/java/org/opentripplanner/framework/application/OTPFeature.java

@@ -30,6 +30,7 @@ public enum OTPFeature {
   CostlyAssertions(
     true,
     false,
+    true,
     "Enable some resource consuming assertions which are typically not meant to be run in production."
   ),
   DebugUi(
@@ -171,14 +172,19 @@ public enum OTPFeature {
 
   private final boolean enabledByDefault;
   private final boolean sandbox;
-
+  private final boolean severeWarningWhenOn;
   private boolean enabled;
   private final String doc;
 
   OTPFeature(boolean defaultEnabled, boolean sandbox, String doc) {
+    this(defaultEnabled, sandbox, false, doc);
+  }
+
+  OTPFeature(boolean defaultEnabled, boolean sandbox, boolean severeWarningWhenOn, String doc) {
     this.enabledByDefault = defaultEnabled;
     this.enabled = defaultEnabled;
     this.sandbox = sandbox;
+    this.severeWarningWhenOn = severeWarningWhenOn;
     this.doc = doc;
   }
 
@@ -195,6 +201,13 @@ public static void enableFeatures(Map<OTPFeature, Boolean> map) {
   public static void logFeatureSetup() {
     LOG.info("Features turned on: \n\t{}", valuesAsString(true));
     LOG.info("Features turned off: \n\t{}", valuesAsString(false));
+    var featureWarnings = enabledValuesWithSevereWarningAsString();
+    if (!featureWarnings.isBlank()) {
+      LOG.warn(
+        "FEATURES THAT SHOULD BE TURNED OFF IN PRODUCTION: \n\t{}",
+        enabledValuesWithSevereWarningAsString()
+      );
+    }
   }
 
   /**
@@ -287,4 +300,11 @@ private static String valuesAsString(boolean enabled) {
       .map(Enum::name)
       .collect(Collectors.joining("\n\t"));
   }
+
+  private static String enabledValuesWithSevereWarningAsString() {
+    return Arrays.stream(values())
+      .filter(it -> it.enabled && it.severeWarningWhenOn)
+      .map(Enum::name)
+      .collect(Collectors.joining("\n\t"));
+  }
 }