Redirect openmetrics.io domain to om dir

Signed-off-by: bwplotka <[email protected]>

Author: bwplotka

public/_redirects

@@ -26,11 +26,13 @@
 /docs/specs/remote_write_spec /docs/specs/prw/remote_write_spec
 /docs/specs/remote_write_spec_2_0 /docs/specs/prw/remote_write_spec_2_0
 
-# Per spec sub dirs should point the currently "latest" version.
-# E.g. https://openmetrics.io redirects to https://prometheus.io/docs/specs/om
+# Per spec sub dirs should point the currently "latest" version, for convenience.
 /docs/specs/om /docs/specs/om/open_metrics_spec
 /docs/specs/prw /docs/specs/prw/remote_write_spec_2_0
 
+# Redirect our custom openmetrics domain to openmetrics spec.
+https://openmetrics.io/* /docs/specs/om/:splat 301!
+
 # Redirect for HTTP SD docs, which briefly lived in the wrong category / repo.
 /docs/instrumenting/http_sd/ /docs/prometheus/latest/http_sd/