gatus: show resolved values on successful conditions, ui as a pass-through

Asked to un-hide endpoint properties; the answer is that nothing was hidden.
All six hide-* options (hide-hostname, hide-url, hide-port, hide-conditions,
hide-errors, and dont-resolve-failed-conditions) already default to false
upstream, so hostname, URL, port, conditions and errors were all being shown.

The one setting that genuinely displays MORE is resolve-successful-conditions.
By default a FAILING check resolves its placeholders - "[STATUS] (502) == 200" -
while a PASSING one drops the value and shows only "[STATUS] == 200". With it
on, a healthy DNS check now reads:

    [DNS_RCODE] (NOERROR) == NOERROR
    [BODY] (64.226.70.190) == 64.226.70.190

which says what it actually resolved to rather than merely that the assertion
held. Applied to all 27 pulled endpoints via a gatus_endpoint_default_ui that
each caller can override.

It applies to pulled endpoints ONLY: an external (push) endpoint has no `ui`
field upstream at all, because it carries no conditions - success comes from the
push. The template was initially emitting the block in both loops; emitting an
unknown key into the external-endpoints list risks a parse rejection, and a
rejected config is exactly what skip-invalid-config-update exists to survive.

Also made the page-level `ui` a pass-through dict, the same shape as
gatus_alerting, so every upstream option (description, dashboard-heading, logo,
link, favicon, buttons, custom-css, dark-mode, default-sort-by,
default-filter-by) is reachable without a variable per key. Replaces the two
one-off gatus_ui_title / gatus_ui_header variables.

Set default-sort-by: group, because the dashboard's own grouping toggle starts
OFF and remembers per browser in localStorage - without it the ten groups render
as one flat list of 86 rows for anyone who has not clicked it.

Note the limit of all this: it is configuration. Layout, card design and group
rendering come from the Vue app compiled into the binary (//go:embed static), so
changing those means forking and rebuilding the image - which would discard the
pinned-digest property the deployment relies on.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

ansible/roles/gatus/defaults/main.yml

@@ -47,8 +47,18 @@ gatus_port: 8080
 # publish this on 0.0.0.0: the external-endpoint push API shares the dashboard's
 # listener, and Caddy is what should be in front of both.
 gatus_bind_address: "127.0.0.1"
-gatus_ui_title: "Status"
-gatus_ui_header: "Status"
+# Pass-through, the same shape as gatus_alerting: whatever is set here is
+# rendered verbatim under `ui:`, so every option upstream supports is reachable
+# without adding a variable per key. See config/ui/ui.go for the full set -
+# title, description, header, dashboard-heading/subheading, logo, link, favicon,
+# buttons, custom-css, dark-mode, default-sort-by, default-filter-by.
+gatus_ui:
+  title: "Status"
+  header: "Status"
+  # Group by default. The dashboard's own groupByGroup toggle starts OFF and
+  # remembers per browser in localStorage, so without this the ten groups render
+  # as one flat list for anyone who has not clicked it.
+  default-sort-by: group
 
 # ── Storage ──────────────────────────────────────────────────────────────────
 # sqlite, not memory: history has to survive a restart, or the dashboard lies

ansible/roles/gatus/templates/config.yaml.j2

@@ -40,8 +40,7 @@ storage:
   maximum-number-of-events: {{ gatus_storage_max_events }}
 
 ui:
-  title: {{ gatus_ui_title }}
-  header: {{ gatus_ui_header }}
+{{ gatus_ui | to_nice_yaml(indent=2) | indent(2, true) }}
 {% if gatus_alerting %}
 
 alerting:

ansible/roles/gatus_endpoint/defaults/main.yml

@@ -42,3 +42,17 @@ gatus_gid: 10001
 # check's cadence and there is no single correct default. See the note in
 # infra/400_host_monitoring.yml.
 gatus_endpoint_default_alerts: []
+
+# UI options applied to every PULLED endpoint that does not set its own.
+#
+# Only pulled endpoints can carry this - an external (push) endpoint has no `ui`
+# field at all, because it has no conditions to display.
+#
+# Note that every hide-* option already defaults to false upstream, so there is
+# nothing to un-hide. The one setting that genuinely shows MORE is
+# resolve-successful-conditions: by default a failing check displays the real
+# value - "[STATUS] (502) == 200" - while a passing one drops it and shows only
+# "[STATUS] == 200". Turning it on resolves both, so a healthy DNS check shows
+# the IP it actually resolved rather than just the assertion.
+gatus_endpoint_default_ui:
+  resolve-successful-conditions: true

ansible/roles/gatus_endpoint/templates/endpoints.yaml.j2

@@ -19,6 +19,7 @@ external-endpoints:
     alerts:
 {{ _alerts | to_nice_yaml(indent=2) | indent(6, true) }}
 {% endif %}
+{# external endpoints have no `ui` field upstream - they carry no conditions #}
 {% endfor %}
 {% endif %}
 {% if gatus_endpoint_pulled %}
@@ -50,5 +51,10 @@ endpoints:
     alerts:
 {{ _alerts | to_nice_yaml(indent=2) | indent(6, true) }}
 {% endif %}
+{% set _ui = e.ui | default(gatus_endpoint_default_ui) %}
+{% if _ui %}
+    ui:
+{{ _ui | to_nice_yaml(indent=2) | indent(6, true) }}
+{% endif %}
 {% endfor %}
 {% endif %}