analytics: Add chart key to remote activity page.

Adds a chart key to the top of the remote activity page.

Also, combines the support and stats links for a remote server into
one column.

analytics/views/remote_activity.py

@@ -69,9 +69,8 @@ def get_remote_server_activity(request: HttpRequest) -> HttpResponse:
         "Analytics users",
         "Mobile users",
         "Last update time",
-        "7 day count of mobile pushes forwarded (includes today's current count)",
-        "Analytics",
-        "Support",
+        "Mobile pushes forwarded",
+        "Links",
     ]
 
     rows = get_query_data(query)
@@ -79,14 +78,12 @@ def get_remote_server_activity(request: HttpRequest) -> HttpResponse:
     totals_columns = [4, 5]
     for row in rows:
         stats = remote_installation_stats_link(row[0])
-        row.append(stats)
+        support = remote_installation_support_link(row[1])
+        links = stats + " " + support
+        row.append(links)
     for i, col in enumerate(cols):
         if col == "Last update time":
             fix_rows(rows, i, format_date_for_activity_reports)
-        if col == "Hostname":
-            for row in rows:
-                support = remote_installation_support_link(row[i])
-                row.append(support)
         if i == 0:
             total_row.append("Total")
         elif i in totals_columns:

templates/analytics/ad_hoc_query.html

@@ -1,5 +1,9 @@
 <h3>{{ data.title }}</h3>
 
+{% if data.title == "Remote servers" %}
+{% include "analytics/remote_activity_key.html" %}
+{% endif %}
+
 {{ data.rows|length}} rows
 <table class="table sortable table-striped table-bordered analytics_table">
 

templates/analytics/remote_activity_key.html

@@ -0,0 +1,11 @@
+<h4>Chart key:</h4>
+<ul>
+    <li><strong>Zulip version</strong> - as of last update time</li>
+    <li><strong>Mobile pushes forwarded</strong> - last 7 days, including today's current count</li>
+    <li><strong>Links</strong>
+        <ul>
+            <li><strong><i class="fa fa-pie-chart"></i></strong> - remote server's stats page</li>
+            <li><strong><i class="fa fa-gear"></i></strong> - remote server's support page</li>
+        </ul>
+    </li>
+</ul>