Update docs for 2.19 (#1671)

Signed-off-by: Ganesh Vernekar <[email protected]>

layouts/footer.html

@@ -24,10 +24,10 @@
         apiKey: '48ac0b7924908a1fd40b1cb18b402ba1',
         indexName: 'prometheus',
         inputSelector: '.searchbox',
-        // Search all pages that either are the latest (2.18) or are not part of the versioned Prometheus docs subtree.
+        // Search all pages that either are the latest (2.19) or are not part of the versioned Prometheus docs subtree.
         // TODO: This requires updating for every new Prometheus version. Switch to the more general "include:true|false"
         // attribute instead, once it's indexed by Algolia.
-        algoliaOptions: { 'facetFilters': [["prometheus-version:2.18", "prometheus-version:none"]] },
+        algoliaOptions: { 'facetFilters': [["prometheus-version:2.19", "prometheus-version:none"]] },
         debug: false // Set debug to true if you want to inspect the dropdown
       });
     </script>

nanoc.yaml

@@ -74,9 +74,19 @@ data_sources:
     identifier_type: legacy
     items_root: /docs/prometheus/latest/
     config:
-      name: 'latest (2.18)' # NOTE! Update the "prometheus-version:2.18" filter in footer.html when changing this.
+      name: 'latest (2.19)' # NOTE! Update the "prometheus-version:2.19" filter in footer.html when changing this.
       repository: https://github.com/prometheus/prometheus.git
-      refspec: release-2.18
+      refspec: release-2.19
+  -
+    type: repo_docs
+    encoding: utf-8
+    items_root: /docs/prometheus/2.19/
+    identifier_type: legacy
+    config:
+      name: '2.19'
+      repository: https://github.com/prometheus/prometheus.git
+      refspec: release-2.19
+      canonical: /docs/prometheus/latest/
   -
     type: repo_docs
     encoding: utf-8
@@ -87,6 +97,7 @@ data_sources:
       repository: https://github.com/prometheus/prometheus.git
       refspec: release-2.18
       canonical: /docs/prometheus/latest/
+      outdated: /docs/prometheus/latest/
   -
     type: repo_docs
     encoding: utf-8