template: when enable_metrics are disabled, hide the empty stats

when metrics are disabled:
* hide the link to /stats at the bottom of the pages
* in /preferences, hide the columns "Response time" and "Reliability"

searx/templates/simple/base.html

@@ -62,9 +62,9 @@
   <footer>
     <p>
     {{ _('Powered by') }} <a href="{{ url_for('info', pagename='about') }}">searxng</a> - {{ searx_version }} — {{ _('a privacy-respecting, hackable metasearch engine') }}<br/>
-        <a href="{{ searx_git_url }}">{{ _('Source code') }}</a> |
-        <a href="{{ get_setting('brand.issue_url') }}">{{ _('Issue tracker') }}</a> |
-        <a href="{{ url_for('stats') }}">{{ _('Engine stats') }}</a>
+        <a href="{{ searx_git_url }}">{{ _('Source code') }}</a>
+        | <a href="{{ get_setting('brand.issue_url') }}">{{ _('Issue tracker') }}</a>
+        {% if enable_metrics %}| <a href="{{ url_for('stats') }}">{{ _('Engine stats') }}</a>{% endif %}
         {% if get_setting('brand.public_instances') %}
         | <a href="{{ get_setting('brand.public_instances') }}">{{ _('Public instances') }}</a>
         {% endif %}

searx/templates/simple/preferences.html

@@ -310,9 +310,9 @@
         <th>{{ _("Supports selected language") }}</th>{{- "" -}}
         <th>{{ _("SafeSearch") }}</th>{{- "" -}}
         <th>{{ _("Time range") }}</th>{{- "" -}}
-        <th>{{ _("Response time") }}</th>{{- "" -}}
+        {%- if enable_metrics %}<th>{{ _("Response time") }}</th>{% endif -%}
         <th>{{ _("Max time") }}</th>{{- "" -}}
-        <th>{{ _("Reliability") }}</th>{{- "" -}}
+        {%- if enable_metrics %}<th>{{ _("Reliability") }}</th>{% endif -%}
       </tr>
       {% for group, engines in engines_by_category[categ] | group_engines_in_tab %}
       {% if loop.length > 1 %}
@@ -336,9 +336,9 @@
         <td>{{ checkbox(None, supports[search_engine.name]['supports_selected_language'], true) }}</td>{{- "" -}}
         <td>{{ checkbox(None, supports[search_engine.name]['safesearch'], true) }}</td>{{- "" -}}
         <td>{{ checkbox(None, supports[search_engine.name]['time_range_support'], true) }}</td>{{- "" -}}
-        {{- engine_time(search_engine.name) -}}
+        {%- if enable_metrics %}{{- engine_time(search_engine.name) -}}{% endif -%}
         <td class="{{ 'danger' if stats[search_engine.name]['warn_timeout'] else '' }}">{{ search_engine.timeout }}</td>{{- "" -}}
-        {{ engine_reliability(search_engine.name) -}}
+        {%- if enable_metrics %}{{ engine_reliability(search_engine.name) -}}{% endif -%}
       </tr>
       {% endif %}
       {% endfor %}

searx/webapp.py

@@ -450,6 +450,7 @@ def render(template_name: str, **kwargs):
     kwargs['instance_name'] = get_setting('general.instance_name')
     kwargs['searx_version'] = VERSION_STRING
     kwargs['searx_git_url'] = GIT_URL
+    kwargs['enable_metrics'] = get_setting('general.enable_metrics')
     kwargs['get_setting'] = get_setting
     kwargs['get_pretty_url'] = get_pretty_url