ISSUE #1979 Metrics link missing

Fixes #1979 

The link for `Metrics` is broken. However, the `Metrics` file is empty. Therefore, I temporarily removed the link in all versions. The same problem happened to `configuration parameters`.

I closed pr #2386 as it brought changes from the master instead of a new branch.

Reviewers: Enrico Olivelli <eolivelli@gmail.com>

This closes #2400 from sijia-w/fix-1979, closes #1979
diff --git a/site/docs/4.10.0/admin/metrics.md b/site/docs/4.10.0/admin/metrics.md
index 142df3d..ff46f01 100644
--- a/site/docs/4.10.0/admin/metrics.md
+++ b/site/docs/4.10.0/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.11.0/admin/metrics.md b/site/docs/4.11.0/admin/metrics.md
index dca2364..fb27c01 100644
--- a/site/docs/4.11.0/admin/metrics.md
+++ b/site/docs/4.11.0/admin/metrics.md
@@ -4,7 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
 
 ## Stats providers
 
@@ -19,7 +18,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.11.1/admin/metrics.md b/site/docs/4.11.1/admin/metrics.md
index dca2364..0048f30 100644
--- a/site/docs/4.11.1/admin/metrics.md
+++ b/site/docs/4.11.1/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for these sinks:
@@ -19,7 +17,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.5.0/admin/metrics.md b/site/docs/4.5.0/admin/metrics.md
index 635135f..fbcec41 100644
--- a/site/docs/4.5.0/admin/metrics.md
+++ b/site/docs/4.5.0/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.5.1/admin/metrics.md b/site/docs/4.5.1/admin/metrics.md
index 635135f..fbcec41 100644
--- a/site/docs/4.5.1/admin/metrics.md
+++ b/site/docs/4.5.1/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.6.0/admin/metrics.md b/site/docs/4.6.0/admin/metrics.md
index 142df3d..ff46f01 100644
--- a/site/docs/4.6.0/admin/metrics.md
+++ b/site/docs/4.6.0/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.6.1/admin/metrics.md b/site/docs/4.6.1/admin/metrics.md
index 142df3d..ff46f01 100644
--- a/site/docs/4.6.1/admin/metrics.md
+++ b/site/docs/4.6.1/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.6.2/admin/metrics.md b/site/docs/4.6.2/admin/metrics.md
index 142df3d..ff46f01 100644
--- a/site/docs/4.6.2/admin/metrics.md
+++ b/site/docs/4.6.2/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.7.0/admin/metrics.md b/site/docs/4.7.0/admin/metrics.md
index 142df3d..ff46f01 100644
--- a/site/docs/4.7.0/admin/metrics.md
+++ b/site/docs/4.7.0/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.7.1/admin/metrics.md b/site/docs/4.7.1/admin/metrics.md
index 142df3d..ff46f01 100644
--- a/site/docs/4.7.1/admin/metrics.md
+++ b/site/docs/4.7.1/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.7.2/admin/metrics.md b/site/docs/4.7.2/admin/metrics.md
index 142df3d..ff46f01 100644
--- a/site/docs/4.7.2/admin/metrics.md
+++ b/site/docs/4.7.2/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.7.3/admin/metrics.md b/site/docs/4.7.3/admin/metrics.md
index 142df3d..ff46f01 100644
--- a/site/docs/4.7.3/admin/metrics.md
+++ b/site/docs/4.7.3/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.8.0/admin/metrics.md b/site/docs/4.8.0/admin/metrics.md
index 142df3d..179a84e 100644
--- a/site/docs/4.8.0/admin/metrics.md
+++ b/site/docs/4.8.0/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.8.1/admin/metrics.md b/site/docs/4.8.1/admin/metrics.md
index 142df3d..ff46f01 100644
--- a/site/docs/4.8.1/admin/metrics.md
+++ b/site/docs/4.8.1/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.8.2/admin/metrics.md b/site/docs/4.8.2/admin/metrics.md
index 142df3d..ff46f01 100644
--- a/site/docs/4.8.2/admin/metrics.md
+++ b/site/docs/4.8.2/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.9.0/admin/metrics.md b/site/docs/4.9.0/admin/metrics.md
index 142df3d..ff46f01 100644
--- a/site/docs/4.9.0/admin/metrics.md
+++ b/site/docs/4.9.0/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.9.1/admin/metrics.md b/site/docs/4.9.1/admin/metrics.md
index 142df3d..ff46f01 100644
--- a/site/docs/4.9.1/admin/metrics.md
+++ b/site/docs/4.9.1/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/4.9.2/admin/metrics.md b/site/docs/4.9.2/admin/metrics.md
index 142df3d..ff46f01 100644
--- a/site/docs/4.9.2/admin/metrics.md
+++ b/site/docs/4.9.2/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for four five sinks:
@@ -22,7 +20,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------
diff --git a/site/docs/latest/admin/metrics.md b/site/docs/latest/admin/metrics.md
index dca2364..0048f30 100644
--- a/site/docs/latest/admin/metrics.md
+++ b/site/docs/latest/admin/metrics.md
@@ -4,8 +4,6 @@
 
 BookKeeper enables metrics collection through a variety of [stats providers](#stats-providers).
 
-> For a full listing of available metrics, see the [Metrics](../../reference/metrics) reference doc.
-
 ## Stats providers
 
 BookKeeper has stats provider implementations for these sinks:
@@ -19,7 +17,7 @@
 
 ## Enabling stats providers in bookies
 
-There are two stats-related [configuration parameters](../../reference/config#statistics) available for bookies:
+Two stats-related [configuration parameters](../../reference/config/) are available for bookies:
 
 Parameter | Description | Default
 :---------|:------------|:-------