Ref #3515: log more and expose more settings in root URL (#3522)

Author: leplatrem

kinto/plugins/history/__init__.py

@@ -1,3 +1,5 @@
+from pyramid.settings import aslist
+
 from kinto.authorization import PERMISSIONS_INHERITANCE_TREE
 from kinto.core import metrics
 from kinto.core.events import ResourceChanged
@@ -6,10 +8,18 @@
 
 
 def includeme(config):
+    settings = config.get_settings()
+    exposed_settings = {}
+    if (trim_history_max := int(settings.get("history.auto_trim_max_count", "-1"))) > 0:
+        exposed_settings["auto_trim_max_count"] = trim_history_max
+    if trim_user_ids := aslist(settings.get("history.auto_trim_user_ids", "")):
+        exposed_settings["auto_trim_user_ids"] = trim_user_ids
+
     config.add_api_capability(
         "history",
         description="Track changes on data.",
         url="http://kinto.readthedocs.io/en/latest/api/1.x/history.html",
+        **exposed_settings,
     )
 
     # Activate end-points.

kinto/plugins/history/listener.py

@@ -162,7 +162,15 @@ def on_resource_changed(event):
                     filters=filters
                     + [Filter("last_modified", trim_before_timestamp, COMPARISON.MAX)],
                 )
-                logger.debug(f"Trimmed {len(deleted)} old history entries.")
+                logger.info(f"Trimmed {len(deleted)} old history entries.")
+            else:
+                logger.info(
+                    "No old history to trim for {user_id!r} on {resource_name!r} in {bucket_uri!r}."
+                )
+        else:
+            logger.info(
+                f"Trimming of old history entries is not enabled{f' for {user_id!r}.' if is_trim_enabled else '.'}"
+            )
 
         # Without explicit permissions, the ACLs on the history entries will
         # fully depend on the inherited permission tree (eg. bucket:read, bucket:write).