Display min, max and last value in description

dashboard.py

@@ -67,6 +67,7 @@ class Widget:
         self.type = d["type"]
         self.stops = d["stops"]
         self.yscale = d.get("yscale", "linear")
+        self.extra = {}
         log.debug("data = %s", d["data"])
         self.lts = LTS(id=d["data"][0]) # by default we handle only one data source
         pass
@@ -137,6 +138,11 @@ class Widget:
                 s += render_template_string(
                         "<tr><th>{{d}}:</th><td>{{v}}</td></tr>",
                         d=d, v=v)
+        for d, v in self.extra.items():
+            if v:
+                s += render_template_string(
+                        "<tr class='extra'><th>{{d}}:</th><td>{{v}}</td></tr>",
+                        d=d, v=v)
         s += "</table>"
         return Markup(s)
 
@@ -362,6 +368,7 @@ class TimeSeries(Widget):
         if self.yscale == "log":
             try:
                 min_value = min(d[1] for d in self.lts.data if d[1] > 0)
+                self.extra["min"] = "%g" % min_value
             except ValueError:
                 # no non-negative values
                 min_value = max_value / 2
@@ -375,6 +382,8 @@ class TimeSeries(Widget):
                 # Make sure min_value is less than max_value
                 min_value /= 2
             log.debug("min_value = %s, max_value = %s", min_value, max_value)
+        self.extra["max"] = "%g" % max_value
+        self.extra["last"] = "%g" % data[-1][1]
         log.debug("collecting data")
         v_data = []
         for i in range(n):

templates/dashboard.html

@@ -53,6 +53,9 @@
         border: 1px solid #CCC;
         padding: 0.5rem;
       }
+      .extra {
+        font-style: italic;
+      }
     </style>
 
   </head>