[i18n] Fallback to en for ja docs; en docs link normalization

.htmltest.yml

@@ -10,10 +10,10 @@ IgnoreDirs:
   - ^blog/(\d+/)?page/\d+
 IgnoreInternalURLs: # list of paths
 IgnoreURLs: # list of regexs of paths or URLs to be ignored
-  - ^(/zh)?/docs/languages/\w+/(api|examples|registry)/$
-  - ^(/zh)?/docs/collector/registry/$
-  - ^(/zh)?/docs/languages/net/(metrics-api|traces-api)/
-  - ^((/zh)?/docs/migration/)?opencensus/$
+  - ^(/..)?/docs/languages/\w+/(api|examples|registry)/$
+  - ^(/..)?/docs/collector/registry/$
+  - ^(/..)?/docs/languages/net/(metrics-api|traces-api)/
+  - ^((/..)?/docs/migration/)?opencensus/$
   - ^/community/end-user/feedback-survey/$
 
   - ^https://deploy-preview-\d+--opentelemetry.netlify.app/

content/en/_index.md

@@ -28,7 +28,7 @@ show_banner: true
 
 - [Learn more](/docs/what-is-opentelemetry/)
 - [Try the demo](/docs/demo/)
-- [Explore integrations](/ecosystem/integrations)
+- [Explore integrations](/ecosystem/integrations/)
 
 </div>
 

content/en/docs/_index.md

@@ -8,13 +8,12 @@ aliases: [/docs/workshop/*]
 OpenTelemetry, also known as OTel, is a vendor-neutral open source
 [Observability](concepts/observability-primer/#what-is-observability) framework
 for instrumenting, generating, collecting, and exporting telemetry data such as
-[traces](/docs/concepts/signals/traces/),
-[metrics](/docs/concepts/signals/metrics/), and
-[logs](/docs/concepts/signals/logs/).
+[traces](concepts/signals/traces/), [metrics](concepts/signals/metrics/), and
+[logs](concepts/signals/logs/).
 
 As an industry-standard, OpenTelemetry is
 [supported by more than 40 observability vendors](/ecosystem/vendors/),
-integrated by many [libraries, services, and apps](/ecosystem/integrations), and
-adopted by [numerous end users](/ecosystem/adopters).
+integrated by many [libraries, services, and apps](/ecosystem/integrations/),
+and adopted by [numerous end users](/ecosystem/adopters/).
 
 ![OpenTelemetry Reference Architecture](/img/otel-diagram.svg)

hugo.yaml

@@ -218,10 +218,10 @@ module:
       target: content
       lang: ja
     # fallback pages
-    # - excludeFiles: specs/*
-    #   source: content/en/docs
-    #   target: content/docs
-    #   lang: ja
+    - excludeFiles: specs/*
+      source: content/en/docs
+      target: content/docs
+      lang: ja
     - source: content/en/announcements
       target: content/announcements
       lang: ja