fix: threshold and logging improvements

- threshold: fix crash when display is None (_format_display now falls
  back to default format string instead of calling None.format())
- threshold: shorten notification messages by stripping plugin-name prefix
  from metric_path (cpu_percent instead of cpu_monitor.cpu_percent)
- main: demote aiohttp.access log records from INFO to DEBUG
- udp: replace debug print with proper logger.info for new host sign-on

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

hbd/server/main.py

@@ -475,6 +475,7 @@ def run(config, config_path=None):
     if config.get("debug", 0) > 0:
         log_level = logging.DEBUG
     logging.basicConfig(level=log_level)
+    logging.getLogger("aiohttp.access").setLevel(logging.DEBUG)
     load_pickled_hosts(config, hbdclass)
 
     notify_mod.initlog(logfile=config.get("logfile", "messages.log"))

hbd/server/threshold.py

@@ -1044,6 +1044,9 @@ class ThresholdChecker:
         # Format operator symbol
         op_symbol = threshold.operator.value
 
+        # Short metric label: strip the plugin-name prefix for readability
+        short_path = metric_path.partition(".")[2] or metric_path
+
         # Use a display-friendly value (inf is the sentinel for "overdue")
         import math
         display_value = "overdue" if isinstance(value, float) and math.isinf(value) else value
@@ -1065,25 +1068,25 @@ class ThresholdChecker:
 
         if new_level == AlertLevel.OK:
             lvl = "RECOVER"
-            message = f"{metric_path} = {display_value} ({old_level.name} -> OK)"
+            message = f"{short_path} = {display_value} ({old_level.name} -> OK)"
         elif new_level == AlertLevel.WARNING:
             lvl = "WARNING"
             if has_display:
-                message = f"{metric_path} = {display_value} {_fmt()}"
+                message = f"{short_path} = {display_value} {_fmt()}"
             else:
-                message = f"{metric_path} = {display_value}"
+                message = f"{short_path} = {display_value}"
         elif new_level == AlertLevel.CRITICAL:
             lvl = "CRITICAL"
             if has_display:
-                message = f"{metric_path} = {display_value} {_fmt()}"
+                message = f"{short_path} = {display_value} {_fmt()}"
             else:
-                message = f"{metric_path} = {display_value}"
+                message = f"{short_path} = {display_value}"
         else:
             lvl = "UNKNOWN"
             if has_display:
-                message = f"{metric_path} = {display_value} {_fmt()}"
+                message = f"{short_path} = {display_value} {_fmt()}"
             else:
-                message = f"{metric_path} = {display_value}"
+                message = f"{short_path} = {display_value}"
 
         # Formatted threshold info stored on AlertState for the UI
         formatted_threshold_msg = _fmt() if has_display and new_level != AlertLevel.OK else None
@@ -1157,6 +1160,9 @@ class ThresholdChecker:
         Returns:
             Formatted display string
         """
+        if not display_format:
+            display_format = "(threshold: {op_symbol} {threshold_value})" if threshold_value is not None else ""
+
         # Build format context with standard variables
         format_context = {
             'value': value,
@@ -1338,6 +1344,7 @@ class ThresholdChecker:
             
             # Format operator symbol
             op_symbol = threshold.operator.value
+            short_path = metric_path.partition(".")[2] or metric_path
 
             # Time to re-notify
             if threshold_value is not None:
@@ -1351,9 +1358,9 @@ class ThresholdChecker:
                     check_name=check_name,
                     metric_name=metric_name,
                 )
-                message = f"REMINDER ({alert_state.level.name}): {host_name} - {metric_path} = {value} {threshold_info}, ongoing for {int(now - alert_state.since)}s"
+                message = f"REMINDER ({alert_state.level.name}): {host_name} - {short_path} = {value} {threshold_info}, ongoing for {int(now - alert_state.since)}s"
             else:
-                message = f"REMINDER ({alert_state.level.name}): {host_name} - {metric_path} = {value} (ongoing for {int(now - alert_state.since)}s)"
+                message = f"REMINDER ({alert_state.level.name}): {host_name} - {short_path} = {value} (ongoing for {int(now - alert_state.since)}s)"
             
             from . import hbdclass
             host = hbdclass.Host.hosts.get(host_name)

hbd/server/udp.py

@@ -336,8 +336,7 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
         # Apply user-access settings from config
         access = config_mod.get_host_access(cfg, uname)
         host.apply_access(access["owner"], access["managers"], access["monitors"])
-        if verbose:
+        logger.info("New host signed on: %s (dyn=%s, access=%s)", uname, host.dyn, access)
-            print(("XX: New host, num now %s" % (len(hbdcls.Host.hosts))))
         newh = True
     else:
         host = hbdcls.Host.hosts[uname]