Remove stats collection code measuring how often Tweets from specific user groups are served

home-mixer/server/src/main/scala/com/twitter/home_mixer/functional_component/decorator/HomeTweetTypePredicates.scala

@@ -220,30 +220,7 @@ object HomeTweetTypePredicates {
       _.getOrElse(ConversationModule2DisplayedTweetsFeature, false)),
     ("conversation_module_has_gap", _.getOrElse(ConversationModuleHasGapFeature, false)),
     ("served_in_recap_tweet_candidate_module_injection", _ => false),
-    ("served_in_threaded_conversation_module", _ => false),
-    (
-      "author_is_elon",
-      candidate =>
-        candidate
-          .getOrElse(AuthorIdFeature, None).contains(candidate.getOrElse(DDGStatsElonFeature, 0L))),
-    (
-      "author_is_power_user",
-      candidate =>
-        candidate
-          .getOrElse(AuthorIdFeature, None)
-          .exists(candidate.getOrElse(DDGStatsVitsFeature, Set.empty[Long]).contains)),
-    (
-      "author_is_democrat",
-      candidate =>
-        candidate
-          .getOrElse(AuthorIdFeature, None)
-          .exists(candidate.getOrElse(DDGStatsDemocratsFeature, Set.empty[Long]).contains)),
-    (
-      "author_is_republican",
-      candidate =>
-        candidate
-          .getOrElse(AuthorIdFeature, None)
-          .exists(candidate.getOrElse(DDGStatsRepublicansFeature, Set.empty[Long]).contains)),
+    ("served_in_threaded_conversation_module", _ => false)
   )
 
   val PredicateMap = CandidatePredicates.toMap

home-mixer/server/src/main/scala/com/twitter/home_mixer/functional_component/feature_hydrator/RequestQueryFeatureHydrator.scala

@@ -1,12 +1,10 @@
 package com.twitter.home_mixer.functional_component.feature_hydrator
 
-import com.twitter.config.yaml.YamlMap
 import com.twitter.finagle.tracing.Annotation.BinaryAnnotation
 import com.twitter.finagle.tracing.ForwardAnnotation
 import com.twitter.home_mixer.model.HomeFeatures._
 import com.twitter.home_mixer.model.request.DeviceContext.RequestContext
 import com.twitter.home_mixer.model.request.HasDeviceContext
-import com.twitter.home_mixer.param.HomeMixerInjectionNames.DDGStatsAuthors
 import com.twitter.joinkey.context.RequestJoinKeyContext
 import com.twitter.product_mixer.component_library.model.cursor.UrtOrderedCursor
 import com.twitter.product_mixer.core.feature.Feature
@@ -24,22 +22,16 @@ import com.twitter.snowflake.id.SnowflakeId
 import com.twitter.stitch.Stitch
 import java.util.UUID
 import javax.inject.Inject
-import javax.inject.Named
 import javax.inject.Singleton
 
 @Singleton
 class RequestQueryFeatureHydrator[
   Query <: PipelineQuery with HasPipelineCursor[UrtOrderedCursor] with HasDeviceContext] @Inject() (
-  @Named(DDGStatsAuthors) ddgStatsAuthors: YamlMap)
-    extends QueryFeatureHydrator[Query] {
+) extends QueryFeatureHydrator[Query] {
 
   override val features: Set[Feature[_, _]] = Set(
     AccountAgeFeature,
     ClientIdFeature,
-    DDGStatsDemocratsFeature,
-    DDGStatsRepublicansFeature,
-    DDGStatsElonFeature,
-    DDGStatsVitsFeature,
     DeviceLanguageFeature,
     GetInitialFeature,
     GetMiddleFeature,
@@ -59,10 +51,6 @@ class RequestQueryFeatureHydrator[
   override val identifier: FeatureHydratorIdentifier = FeatureHydratorIdentifier("Request")
 
   private val DarkRequestAnnotation = "clnt/has_dark_request"
-  private val Democrats = "democrats"
-  private val Republicans = "republicans"
-  private val Elon = "elon"
-  private val Vits = "vits"
 
   // Convert Language code to ISO 639-3 format
   private def getLanguageISOFormatByCode(languageCode: String): String =
@@ -83,16 +71,6 @@ class RequestQueryFeatureHydrator[
     val featureMap = FeatureMapBuilder()
       .add(AccountAgeFeature, query.getOptionalUserId.flatMap(SnowflakeId.timeFromIdOpt))
       .add(ClientIdFeature, query.clientContext.appId)
-      /**
-       * These author ID lists are used purely for metrics collection. We track how often we are
-       * serving Tweets from these authors and how often their tweets are being impressed by users.
-       * This helps us validate in our A/B experimentation platform that we do not ship changes
-       * that negatively impacts one group over others.
-       */
-      .add(DDGStatsDemocratsFeature, ddgStatsAuthors.longSeq(Democrats).toSet)
-      .add(DDGStatsRepublicansFeature, ddgStatsAuthors.longSeq(Republicans).toSet)
-      .add(DDGStatsVitsFeature, ddgStatsAuthors.longSeq(Vits).toSet)
-      .add(DDGStatsElonFeature, ddgStatsAuthors.longValue(Elon))
       .add(DeviceLanguageFeature, query.getLanguageCode.map(getLanguageISOFormatByCode))
       .add(
         GetInitialFeature,

home-mixer/server/src/main/scala/com/twitter/home_mixer/model/HomeFeatures.scala

@@ -176,10 +176,6 @@ object HomeFeatures {
     override def personalDataTypes: Set[pd.PersonalDataType] = Set(pd.PersonalDataType.ClientType)
   }
   object CachedScoredTweetsFeature extends Feature[PipelineQuery, Seq[hmt.CachedScoredTweet]]
-  object DDGStatsElonFeature extends Feature[PipelineQuery, Long]
-  object DDGStatsVitsFeature extends Feature[PipelineQuery, Set[Long]]
-  object DDGStatsDemocratsFeature extends Feature[PipelineQuery, Set[Long]]
-  object DDGStatsRepublicansFeature extends Feature[PipelineQuery, Set[Long]]
   object DeviceLanguageFeature extends Feature[PipelineQuery, Option[String]]
   object DismissInfoFeature
       extends FeatureWithDefaultOnFailure[PipelineQuery, Map[st.SuggestType, Option[DismissInfo]]] {

home-mixer/server/src/main/scala/com/twitter/home_mixer/module/HomeMixerResourcesModule.scala

@@ -1,18 +1,5 @@
 package com.twitter.home_mixer.module
 
-import com.google.inject.Provides
-import com.twitter.config.yaml.YamlMap
-import com.twitter.home_mixer.param.HomeMixerInjectionNames.DDGStatsAuthors
 import com.twitter.inject.TwitterModule
-import javax.inject.Named
-import javax.inject.Singleton
 
-object HomeMixerResourcesModule extends TwitterModule {
-
-  private val AuthorsFile = "/config/authors.yml"
-
-  @Provides
-  @Singleton
-  @Named(DDGStatsAuthors)
-  def providesDDGStatsAuthors(): YamlMap = YamlMap.load(AuthorsFile)
-}
+object HomeMixerResourcesModule extends TwitterModule {}

home-mixer/server/src/main/scala/com/twitter/home_mixer/param/HomeMixerInjectionNames.scala

@@ -4,7 +4,6 @@ object HomeMixerInjectionNames {
   final val AuthorFeatureRepository = "AuthorFeatureRepository"
   final val CandidateFeaturesScribeEventPublisher = "CandidateFeaturesScribeEventPublisher"
   final val CommonFeaturesScribeEventPublisher = "CommonFeaturesScribeEventPublisher"
-  final val DDGStatsAuthors = "DDGStatsAuthors"
   final val EarlybirdRepository = "EarlybirdRepository"
   final val EngagementsReceivedByAuthorCache = "EngagementsReceivedByAuthorCache"
   final val GraphTwoHopRepository = "GraphTwoHopRepository"