fix: show comment for host notification results in log views

PainterLogComment.render() used a hardcoded threshold of 6
";"-separated fields to decide whether a notification log line
carries a trailing comment. That threshold only matches the layout
of SERVICE notification log lines, which have an extra ";<service>"
segment (7 fields with a comment). HOST notification log lines lack
that segment, so even with a comment present they only ever reach 6
fields and never cross the "> 6" bar -- the comment column silently
stays empty for every host notification, regardless of what the
notification plugin wrote to stdout.

Extract the threshold into _log_comment_min_fields(log_type), which
returns 6 for service log types and 5 for host log types, and have
PainterLogComment request the log_type column (already used by the
neighboring PainterLogPluginOutput) to pick the right one.

Author: PhilippLemke

cmk/gui/painter/v0/painters.py

@@ -5835,6 +5835,19 @@ def render(self, row: Row, cell: Cell, user: LoggedInUser) -> CellSpec:
         return ("", row["log_options"])
 
 
+def _log_comment_min_fields(log_type: str) -> int:
+    """Minimum number of ";"-separated fields in a notification log line
+    before a trailing comment field is present.
+
+    Host notification log lines have one field fewer than service
+    notification log lines (they lack the ";<service>" segment), so the
+    threshold below which no comment field can be present differs between
+    the two. See cmk.events.log_to_history._format_notification_message,
+    which is the counterpart producing these log lines.
+    """
+    return 6 if "SERVICE" in log_type else 5
+
+
 class PainterLogComment(Painter):
     @property
     @override
@@ -5852,14 +5865,14 @@ def short_title(self, cell: Cell) -> str:
     @property
     @override
     def columns(self) -> Sequence[ColumnName]:
-        return ["log_options"]
+        return ["log_options", "log_type"]
 
     @override
     def render(self, row: Row, cell: Cell, user: LoggedInUser) -> CellSpec:
         msg = row["log_options"]
         if ";" in msg:
             parts = msg.split(";")
-            if len(parts) > 6:
+            if len(parts) > _log_comment_min_fields(row.get("log_type", "")):
                 return ("", parts[-1])
         return ("", "")
 

tests/unit/cmk/gui/plugins/views/test_painters.py

@@ -23,7 +23,7 @@
 from cmk.gui.http import request
 from cmk.gui.logged_in import user
 from cmk.gui.painter.v0 import all_painters
-from cmk.gui.painter.v0.painters import _paint_custom_notes
+from cmk.gui.painter.v0.painters import _log_comment_min_fields, _paint_custom_notes
 from cmk.gui.type_defs import ColumnSpec, DynamicIconName, Row
 from cmk.gui.utils.html import HTML
 from cmk.gui.utils.roles import UserPermissions
@@ -1655,3 +1655,47 @@ def test_paint_custom_notes_file_inclusion_and_html_tags(
     expected_string = str(HTML.without_escaping("<hr>".join(expected_notes)))
 
     assert expected_string == notes_as_string
+
+
+@pytest.mark.parametrize(
+    "log_type, log_options, expected_comment",
+    [
+        # Host notification log lines have no ";<service>" segment, so with
+        # a comment present they only ever reach 6 fields, not 7.
+        pytest.param(
+            "HOST NOTIFICATION RESULT",
+            "cmkadmin;myhost;CRITICAL;my_plugin;some output;the comment",
+            "the comment",
+            id="host-with-comment",
+        ),
+        pytest.param(
+            "HOST NOTIFICATION RESULT",
+            "cmkadmin;myhost;CRITICAL;my_plugin;some output",
+            "",
+            id="host-without-comment",
+        ),
+        pytest.param(
+            "SERVICE NOTIFICATION RESULT",
+            "cmkadmin;myhost;My Service;CRITICAL;my_plugin;some output;the comment",
+            "the comment",
+            id="service-with-comment",
+        ),
+        pytest.param(
+            "SERVICE NOTIFICATION RESULT",
+            "cmkadmin;myhost;My Service;CRITICAL;my_plugin;some output",
+            "",
+            id="service-without-comment",
+        ),
+    ],
+)
+def test_log_comment_field_count(
+    log_type: str, log_options: str, expected_comment: str
+) -> None:
+    # Regression test for the comment field being silently dropped for host
+    # notifications: PainterLogComment.render used a hardcoded threshold of
+    # 6 fields that only matches the (one field longer) service notification
+    # log line layout.
+    parts = log_options.split(";")
+    min_fields = _log_comment_min_fields(log_type)
+    actual_comment = parts[-1] if len(parts) > min_fields else ""
+    assert actual_comment == expected_comment