[HUD] Clarify Unstable jobs panel subtitle

Name the two groups the panel unions and say the marker is applied at
runtime, so the subtitle doesn't read as the filed UNSTABLE issue list.

Author: georgehong

torchci/clickhouse_queries/master_commit_red_jobs/query.sql

@@ -45,10 +45,10 @@ WITH all_jobs AS (
       AND j.name NOT LIKE '%filter%'
       AND j.name LIKE '%/%'
       -- Normal mode ({unstableOnly}=0): exclude unstable jobs, keep the requested
-      -- workflows. Unstable mode ({unstableOnly}=1): the dedicated "unstable"
-      -- workflow, plus any job marked unstable (including scheduled/nightly);
-      -- workflowNames is unused in that mode. Both modes drop workflow_run-chained
-      -- jobs via the shared line below.
+      -- workflows. Unstable mode ({unstableOnly}=1): the union of the "unstable"
+      -- workflow and jobs whose name carries the runtime unstable marker;
+      -- workflowNames is unused there. Both modes drop workflow_run-chained jobs
+      -- via the shared line below.
       AND (
             (
               {unstableOnly: UInt8} = 0

torchci/pages/reliability/[repoOwner]/[repoName]/[[...page]].tsx

@@ -574,16 +574,14 @@ export default function Page() {
 
         <Grid size={{ xs: 6 }} height={ROW_HEIGHT}>
           {/*
-            Unstable jobs to watch: union of the dedicated "unstable" workflow and
-            any job marked unstable on main (any trigger; workflow_run-chained jobs
-            excluded). Same query as the other panels with unstableOnly=1, which
-            flips its unstable filter; workflowNames is unused in that mode.
+            Unstable jobs to watch: the union of unstable.yml and jobs whose name
+            carries the runtime unstable marker.
           */}
           <GroupReliabilityPanel
             title={"Unstable jobs"}
             subtitle={
-              UNSTABLE_WORKFLOWS.join(", ") +
-              " workflow + main jobs marked unstable"
+              UNSTABLE_WORKFLOWS.map((w) => `${w}.yml`).join(", ") +
+              " + jobs tagged unstable at runtime"
             }
             queryName={queryName}
             queryParams={{ unstableOnly: 1, ...queryParams }}