fix(prometheus): keep/drop patterns split on any whitespace, and a *_time_seconds value reads as a moment (#6423)

A pasted drop list whose line breaks had become spaces was stored as one
pattern that matched nothing, so Home Assistant's two 526-series
bookkeeping families filled the 1,000-series cap. No metric name holds
whitespace, so patterns now split on spaces and tabs as well as lines
and commas.

Home Assistant names its Unix times *_time_seconds (e.g.
homeassistant_last_updated_time_seconds), which read as "20751d 21h".
is_moment() takes both suffixes, for the value shown and the chart axis.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

plugins/prometheus/service.py

@@ -122,13 +122,23 @@ def fold_states(metric: str, rows: list[dict]) -> list[dict] | None:
     return folded
 
 
+# A series named for a moment holds Unix seconds, not a span of time: the
+# convention's *_timestamp_seconds, and the *_time_seconds some exporters use
+# (Home Assistant's homeassistant_last_updated_time_seconds).
+MOMENT_SUFFIXES = ("_timestamp_seconds", "_time_seconds")
+
+
+def is_moment(metric: str) -> bool:
+    return metric.endswith(MOMENT_SUFFIXES)
+
+
 def shown_value(metric: str, value: float | None) -> dict:
     """A series' value in its unit, from the Prometheus naming conventions.
-    A *_timestamp_seconds is a moment: it comes back as `moment` for the page
-    to show as "3m ago" in the reader's zone; 0 there means "never"."""
+    A moment (is_moment) comes back as `moment` for the page to show as
+    "3m ago" in the reader's zone; 0 there means "never"."""
     if value is None:
         return {"text": "—", "moment": None}
-    if metric.endswith("_timestamp_seconds"):
+    if is_moment(metric):
         if value <= 0:
             return {"text": "never", "moment": None}
         return {"text": "", "moment": datetime.fromtimestamp(value, timezone.utc)}
@@ -184,11 +194,12 @@ def map_families(target: str, families: dict[str, prometheus.Family], keep: list
 # ── The form ─────────────────────────────────────────────────────────────────
 
 def patterns(text: str) -> list[str]:
-    """Name patterns from a textarea: one per line or comma-separated."""
+    """Name patterns from a textarea: one per line, or separated by commas or
+    spaces. A metric name never holds whitespace, so a paste that turned line
+    breaks into spaces still reads as the patterns it was."""
     out: list[str] = []
-    for line in (text or "").replace(",", "\n").splitlines():
-        p = line.strip()
-        if p and p not in out:
+    for p in (text or "").replace(",", " ").split():
+        if p not in out:
             out.append(p)
     return out