diff --git a/app/logging.py b/app/logging.py
index 6106137..3a4264f 100644
--- a/app/logging.py
+++ b/app/logging.py
@@ -1,27 +1,17 @@
 import json
 import logging
-from datetime import datetime, timezone
-from typing import Any
+from urllib.parse import urlsplit, urlunsplit
 
 
-class JsonFormatter(logging.Formatter):
-    def format(self, record: logging.LogRecord) -> str:
-        data: dict[str, Any] = {
-            "timestamp": datetime.now(timezone.utc).isoformat(),
-            "level": record.levelname,
-            "logger": record.name,
-            "message": record.getMessage(),
-        }
-        for key in ("event", "monitor_id", "url", "outcome", "error_code", "latency_ms"):
-            value = getattr(record, key, None)
-            if value is not None:
-                data[key] = value
-        return json.dumps(data, separators=(",", ":"), default=str)
+def redacted_url(url: str) -> str:
+    parsed = urlsplit(url)
+    host = parsed.hostname or ""
+    if ":" in host and not host.startswith("["):
+        host = f"[{host}]"
+    if parsed.port:
+        host = f"{host}:{parsed.port}"
+    return urlunsplit((parsed.scheme, host, parsed.path, "REDACTED" if parsed.query else "", ""))
 
 
-def configure_logging(level: str) -> None:
-    handler = logging.StreamHandler()
-    handler.setFormatter(JsonFormatter())
-    root = logging.getLogger()
-    root.handlers[:] = [handler]
-    root.setLevel(level.upper())
+def log_event(logger: logging.Logger, event: str, **fields: object) -> None:
+    logger.info(json.dumps({"event": event, **fields}, default=str, sort_keys=True))