Streamline missing data warnings, review logging

web/frontend/src/generic/joblist/JobListRow.svelte

@@ -229,7 +229,10 @@
             ></Card
           >
         {:else}
-          <Card body color="warning">No dataset returned</Card>
+          <Card body class="mx-2" color="warning">
+            <p>No dataset returned for <b>{metrics[i]}</b></p>
+            <p class="mb-1">Metric was not found in metric store for cluster <b>{job.cluster}</b>.</p>
+          </Card>
         {/if}
       </td>
     {/each}

web/frontend/src/generic/plots/MetricPlot.svelte

@@ -27,7 +27,7 @@
   import uPlot from "uplot";
   import { formatNumber, formatDurationTime } from "../units.js";
   import { getContext, onMount, onDestroy } from "svelte";
-  import { Card } from "@sveltestrap/sveltestrap";
+  import { Card, CardBody, CardHeader } from "@sveltestrap/sveltestrap";
 
   /* Svelte 5 Props */
   let {
@@ -633,7 +633,13 @@
         style="background-color: {backgroundColor()};" class={forNode ? 'py-2 rounded' : 'rounded'}
   ></div>
 {:else}
-  <Card body color="warning" class="mx-4"
-    >Cannot render plot: No series data returned for <code>{metric}</code></Card
-  >
+  <Card color="warning" class={forNode ? 'mx-2' : 'mt-2'}>
+    <CardHeader class="mb-0">
+      <b>Empty Metric</b>
+    </CardHeader>
+    <CardBody>
+      <p>Cannot render plot for <b>{metric}</b>.</p>
+      <p class="mb-1">Metric found but returned without timeseries data.</p>
+    </CardBody>
+  </Card>
 {/if}