Adding logging to lru evictions updateTermEmbeddingCache, a=chris

diff --git a/src/library/media_jobs/RecommendationJob.php b/src/library/media_jobs/RecommendationJob.php
index 152ee2975..c34919711 100644
--- a/src/library/media_jobs/RecommendationJob.php
+++ b/src/library/media_jobs/RecommendationJob.php
@@ -385,11 +385,12 @@ class RecommendationJob extends MediaJob
                     $context_term_embedding = pack("E*",
                         ...$context_term_embedding);
                     $this->updateTermEmbeddingCache($context_term_id,
-                        $context_term_embedding, C\THREAD_RECOMMENDATION);
+                        $context_term_embedding, C\THREAD_RECOMMENDATION,
+                        "context_update");
                 }
                 $term_embedding = pack("E*", ...$term_embedding);
                 $this->updateTermEmbeddingCache($term_id, $term_embedding,
-                    C\THREAD_RECOMMENDATION);
+                    C\THREAD_RECOMMENDATION, "term_update");
             }
             $item_count++;
         }
@@ -1296,13 +1297,15 @@ class RecommendationJob extends MediaJob
      * @param int $term_id
      * @param string $term_embedding
      * @param int $item_type
+     * @param string $string
      */
     public function updateTermEmbeddingCache($term_id, $term_embedding,
-        $item_type)
+        $item_type, $message = "")
     {
         $db = $this->db;
         $evicted_item = $this->lru_cache->put($term_id, $term_embedding);
         if (isset($evicted_item)) {
+            L\crawlLog("$message {$evicted_item[0]} was evicted");
             $on_conflict = in_array($db->to_upper_dbms, ["MYSQL"]) ?
                 " ON DUPLICATE KEY " :
                 " ON CONFLICT (ITEM_TYPE, ID) DO UPDATE ";
@@ -1320,7 +1323,7 @@ class RecommendationJob extends MediaJob
      */
     public function saveTermEmbeddingsCacheToDb($item_type)
     {
-        L\crawlLog("Doing final persistence flush of LRU cache for $item_type");
+        L\crawlLog("Doing final persistence flush of LRU cache for $item_");
         $db = $this->db;
         $base_delete_sql = "DELETE FROM RECOMMENDATION_TERM_EMBEDDING" .
             " WHERE ITEM_TYPE = ? AND ID IN (";