Time-boxed entries for the banner (#4429)

Co-authored-by: Severin Neumann <[email protected]>
Co-authored-by: opentelemetrybot <[email protected]>
Co-authored-by: Patrice Chalin <[email protected]>
Co-authored-by: Severin Neumann <[email protected]>

Author: 4 people

content/en/_index.md

@@ -3,13 +3,25 @@ title: OpenTelemetry
 description: >-
   High-quality, ubiquitous, and portable telemetry to enable effective
   observability
-show_banner: true
 outputs:
   - HTML
   - REDIRECTS # Include this `content/en` ONLY
 developer_note:
   The blocks/cover shortcode (used below) will use as a background image any
   image file containing "background" in its name.
+show_banner: true
+limit_banner: 2 # Default to 2, adjust as needed
+banners:
+  - message:
+      '<i class="fas fa-bullhorn"></i> Join us for [**OTel Community Day** on
+      June
+      25th](https://events.linuxfoundation.org/open-telemetry-community-day/)!'
+    to: 2024-06-25
+  - message:
+      '<i class="fas fa-bullhorn"></i> Help improve OTel and Prometheus
+      interoperability: [complete our
+      survey](https://forms.gle/bZAG9f7udoJsjZUG9) by May 31'
+    to: 2024-05-31
 ---
 
 <div class="d-none"><a rel="me" href="https://fosstodon.org/@opentelemetry"></a></div>

layouts/partials/banner.md

@@ -1,17 +1,20 @@
-{{/* cSpell:ignore contribfest */ -}}
-{{ if .Params.show_banner -}}
-
+{{/* cSpell:ignore markdownify */ -}}
+{{ if and .Params.show_banner (gt (len (.Params.banners | default slice)) 0) }}
+  {{ $limit := .Params.limit_banner | default 2 }}
+  {{ $sorted := sort .Params.banners "to" }}
+  {{ $currentDate := now.Format "2006-01-02" }}
+  {{ $filtered := slice }}
+  {{ range $sorted }}
+    {{ if le $currentDate .to }}
+      {{ if lt (len $filtered) $limit }}
+        {{ $filtered = $filtered | append . }}
+      {{ end }}
+    {{ end }}
+  {{ end }}
 <div class="o-banner">
-
-<i class="fas fa-bullhorn"></i> Join us for 
-[**OTel Community Day** on June 25th](https://sessionize.com/OTel-Community-Day/)!
-
-
+    {{ range $filtered }}
 <!-- prettier-ignore -->
-<i class="fas fa-bullhorn"></i>
-Help improve OTel and Prometheus interoperability: [complete our survey](https://forms.gle/bZAG9f7udoJsjZUG9) by May 31
-{.pt-0}
-
-
+{{ .message | markdownify }}
+    {{ end }}
 </div>
-{{ end -}}
+{{ end -}}