Add third-level titles to the Metrics ref page (neo4j#1435)

Make metric classes more visible.

modules/ROOT/pages/monitoring/metrics/reference.adoc

@@ -1,4 +1,6 @@
 :description: This section includes metrics that are primarily to allow Neo4j experts to fine-tune specific issues.
+:page-styles: hide-table-captions
+
 [role=enterprise-edition]
 [[metrics-reference]]
 = Metrics reference
@@ -74,8 +76,9 @@ By default, database metrics include:
 == General-purpose metrics
 
 [[bolt-metrics]]
-.Bolt metrics
+=== Bolt metrics
 
+.Bolt metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -95,8 +98,11 @@ By default, database metrics include:
 |===
 
 [[bolt-driver-metrics]]
-.Bolt Driver metrics label:new[Introduced in 5.13]
+=== Bolt Driver metrics
+
+label:new[Introduced in 5.13]
 
+.Bolt Driver metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -107,8 +113,9 @@ By default, database metrics include:
 |===
 
 [[checkpointing-metrics]]
-.Database checkpointing metrics
+=== Database checkpointing metrics
 
+.Database checkpointing metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -124,8 +131,9 @@ By default, database metrics include:
 |===
 
 [[cypher-metrics]]
-.Cypher metrics
+=== Cypher metrics
 
+.Cypher metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -134,8 +142,9 @@ By default, database metrics include:
 |===
 
 [[db-data-count-metrics]]
-.Database data count metrics
+=== Database data count metrics
 
+.Database data count metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -145,8 +154,9 @@ By default, database metrics include:
 |===
 
 [[db-neo4j-pool-metrics]]
-.Database neo4j pools metrics
+=== Database neo4j pools metrics
 
+.Database neo4j pools metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -159,8 +169,9 @@ By default, database metrics include:
 
 
 [[db-operation-count-metrics]]
-.Database operation count metrics
+=== Database operation count metrics
 
+.Database operation count metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -173,8 +184,11 @@ By default, database metrics include:
 |===
 
 [[db-state-count-metrics]]
-.Database state count metrics label:new[Introduced in 5.7]
+=== Database state count metrics 
 
+label:new[Introduced in 5.7]
+
+.Database state count metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -184,8 +198,11 @@ By default, database metrics include:
 |===
 
 [[db-data-metrics]]
-.Database data metrics label:deprecated[Deprecated in 5.15]
+=== Database data metrics 
+
+label:deprecated[Deprecated in 5.15]
 
+.Database data metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name
@@ -205,8 +222,9 @@ By default, database metrics include:
 |===
 
 [[global-neo4j-pools-metrics]]
-.Global neo4j pools metrics
+=== Global neo4j pools metrics
 
+.Global neo4j pools metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -218,8 +236,9 @@ By default, database metrics include:
 |===
 
 [[db-page-cache-metrics]]
-.Database page cache metrics
+=== Database page cache metrics
 
+.Database page cache metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -250,8 +269,9 @@ By default, database metrics include:
 |===
 
 [[query-execution-metrics]]
-.Query execution metrics
+=== Query execution metrics
 
+.Query execution metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -270,8 +290,11 @@ By default, database metrics include:
 |===
 
 [[query-routing-metrics]]
-.Query routing metrics label:new[Introduced in 5.10]
+=== Query routing metrics
 
+label:new[Introduced in 5.10]
+
+.Query routing metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -284,8 +307,9 @@ By default, database metrics include:
 |===
 
 [[db-store-size-metrics]]
-.Database store size metrics
+=== Database store size metrics
 
+.Database store size metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -294,8 +318,9 @@ By default, database metrics include:
 |===
 
 [[db-tx-log-metrics]]
-.Database transaction log metrics
+=== Database transaction log metrics
 
+.Database transaction log metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -308,8 +333,9 @@ By default, database metrics include:
 |===
 
 [[db-tx-metrics]]
-.Database transaction metrics
+=== Database transaction metrics
 
+.Database transaction metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -334,8 +360,9 @@ By default, database metrics include:
 |===
 
 [[db-index-metrics]]
-.Database index metrics
+=== Database index metrics
 
+.Database index metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -359,8 +386,9 @@ By default, database metrics include:
 |===
 
 [[server-metrics]]
-.Server metrics
+=== Server metrics
 
+.Server metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -373,17 +401,19 @@ By default, database metrics include:
 == Metrics specific to clustering
 
 [[catchup-metrics]]
-.CatchUp metrics
+=== CatchUp metrics
 
+.CatchUp metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
 |<prefix>.cluster.catchup.tx_pull_requests_received|TX pull requests received from other cluster members. (counter)
 |===
 
 [[discovery-metrics]]
-.Discovery metrics
+=== Discovery metrics
 
+.Discovery metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -396,7 +426,11 @@ By default, database metrics include:
 |===
 
 [[raft-core-metrics]]
-.Raft core metrics label:deprecated[Deprecated in 5.0]
+=== Raft core metrics 
+
+label:deprecated[Deprecated in 5.0]
+
+.Raft core metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name
@@ -485,8 +519,9 @@ The deprecated Raft core metrics are replaced accordingly by the Raft metrics in
 ====
 
 [[raft-metrics]]
-.Raft metrics
+=== Raft metrics
 
+.Raft metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -520,7 +555,11 @@ The deprecated Raft core metrics are replaced accordingly by the Raft metrics in
 
 
 [[read-replica-metrics]]
-.Read Replica metrics label:deprecated[Deprecated in 5.0]
+=== Read Replica metrics
+
+label:deprecated[Deprecated in 5.0]
+
+.Read Replica metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name
@@ -543,8 +582,9 @@ The deprecated Read Replica metrics are replaced accordingly by the Story copy m
 ====
 
 [[store-copy-metrics]]
-.Store copy metrics
+=== Store copy metrics
 
+.Store copy metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -554,8 +594,6 @@ The deprecated Read Replica metrics are replaced accordingly by the Story copy m
 |===
 
 
-
-
 [[jvm-metrics]]
 == Java Virtual Machine Metrics
 
@@ -569,8 +607,9 @@ Neo4j allocates buffers in those pools as it needs them.
 You can limit this memory using JVM settings, but there is never any good reason for you to set them.
 
 [[jvm-file-descriptor-metrics]]
-.JVM file descriptor metrics
+=== JVM file descriptor metrics
 
+.JVM file descriptor metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -579,8 +618,9 @@ You can limit this memory using JVM settings, but there is never any good reason
 |===
 
 [[gc-metrics]]
-.GC metrics
+=== GC metrics
 
+.GC metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -589,8 +629,9 @@ You can limit this memory using JVM settings, but there is never any good reason
 |===
 
 [[jvm-heap-metrics]]
-.JVM Heap metrics
+=== JVM Heap metrics
 
+.JVM Heap metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -600,8 +641,9 @@ You can limit this memory using JVM settings, but there is never any good reason
 |===
 
 [[jvm-memory-buffers-metrics]]
-.JVM memory buffers metrics
+=== JVM memory buffers metrics
 
+.JVM memory buffers metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
@@ -611,30 +653,32 @@ You can limit this memory using JVM settings, but there is never any good reason
 |===
 
 [[jvm-memory-pools-metrics]]
-.JVM memory pools metrics
+=== JVM memory pools metrics
 
+.JVM memory pools metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
 |<prefix>.vm.memory.pool.<pool>|Estimated amount of memory in bytes used by the pool. (gauge)
 |===
 
 [[jvm-pause-time-metrics]]
-.JVM pause time metrics
+=== JVM pause time metrics
 
+.JVM pause time metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
 |<prefix>.vm.pause_time|Accumulated detected VM pause time. (counter)
 |===
 
 [[jvm-threads-metrics]]
-.JVM threads metrics
+=== JVM threads metrics
 
+.JVM threads metrics
 [options="header",cols="<3m,<4"]
 |===
 |Name |Description
 |<prefix>.vm.threads|The total number of live threads including daemon and non-daemon threads. (gauge)
 |===
 
-