Split changelog entries for discord (#23832)

* Split changelog entries for discord

Not sure where best to split it, by entry in group or by author.

* Formatting

Tools/actions_changelogs_since_last_run.py

@@ -109,11 +109,13 @@ def send_to_discord(entries: Iterable[ChangelogEntry]) -> None:
         print(f"No discord webhook URL found, skipping discord send")
         return
 
-    content = io.StringIO()
     count: int = 0
 
     for name, group in itertools.groupby(entries, lambda x: x["author"]):
+        count = 0
+        content = io.StringIO()
         content.write(f"**{name}** updated:\n")
+
         for entry in group:
             for change in entry["changes"]:
                 emoji = TYPES_TO_EMOJI.get(change['type'], "❓")
@@ -125,12 +127,6 @@ def send_to_discord(entries: Iterable[ChangelogEntry]) -> None:
                 else:
                     content.write(f"{emoji} - {message}\n")
 
-    if count == 0:
-        print("Skipping discord push as no changelog entries found")
-        return
-
-    print(f"Posting {count} changelog entries to discord webhook")
-
             body = {
                 "content": content.getvalue(),
                 # Do not allow any mentions.
@@ -141,6 +137,13 @@ def send_to_discord(entries: Iterable[ChangelogEntry]) -> None:
                 "flags": 1 << 2
             }
             
+        # No entries?
+        if count == 0:
+          continue
+
+        # Post per group to try to avoid discord character limits
+        print(f"Posting {count} changelog entries to discord webhook")
+
         response = requests.post(DISCORD_WEBHOOK_URL, json=body)
         response.raise_for_status()