atlasbot: gate metric keys by token overlap

atlasbot/engine/answerer.py

@@ -1431,6 +1431,8 @@ async def _select_metric_chunks(
     selected = _parse_key_list(raw, available_keys, max_keys)
     if candidate_keys:
         selected = _merge_metric_keys(selected, candidate_keys, max_keys)
+    if selected and candidate_keys and not _metric_key_overlap(selected, token_set):
+        selected = candidate_keys[:max_keys]
     if not selected and candidate_keys:
         selected = candidate_keys[:max_keys]
     if available_keys:
@@ -1582,6 +1584,17 @@ def _filter_metric_keys(keys: list[str], tokens: set[str]) -> list[str]:
     return [item[1] for item in ranked]
 
 
+def _metric_key_overlap(keys: list[str], tokens: set[str]) -> bool:
+    if not keys or not tokens:
+        return False
+    lowered_tokens = {token.lower() for token in tokens if token and len(token) >= TOKEN_MIN_LEN}
+    for key in keys:
+        parts = [part for part in re.split(r"[_\\W]+", key.lower()) if part]
+        if set(parts) & lowered_tokens:
+            return True
+    return False
+
+
 def _lines_for_metric_keys(lines: list[str], keys: list[str], max_lines: int = 0) -> list[str]:
     if not lines or not keys:
         return []