[Stack Monitoring] Put elasticsearch.node.stats.jvm.mem.pools.* (#4…

…0571)

This re-adds the pools to the `node_stats` metric set.

CHANGELOG.next.asciidoc

@@ -55,6 +55,7 @@ https:/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Remove fallback to the node limit for the `kubernetes.pod.cpu.usage.limit.pct` and `kubernetes.pod.memory.usage.limit.pct` metrics calculation
 - Add support for Kibana status metricset in v8 format {pull}40275[40275]
 - Update metrics for the vSphere Host metricset. {pull}40429[40429]
+- Added back `elasticsearch.node.stats.jvm.mem.pools.*` to the `node_stats` metricset {pull}40571[40571]
 
 *Osquerybeat*
 
@@ -356,13 +357,3 @@ https:/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 
 
 ==== Known Issues
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metricbeat/module/elasticsearch/node_stats/data.go

@@ -46,6 +46,11 @@ var (
  "pct": c.Int("heap_used_percent"),
  },
  },
+ "pools": c.Dict("pools", s.Schema{
+ "young": c.Dict("young", poolSchema),
+ "survivor": c.Dict("survivor", poolSchema),
+ "old": c.Dict("old", poolSchema),
+ }),
  }),
  "gc": c.Dict("gc", s.Schema{
  "collectors": c.Dict("collectors", s.Schema{
@@ -308,6 +313,21 @@ var (
  },
  }
 
+ poolSchema = s.Schema{
+ "used": s.Object{
+ "bytes": c.Int("used_in_bytes"),
+ },
+ "max": s.Object{
+ "bytes": c.Int("max_in_bytes"),
+ },
+ "peak": s.Object{
+ "bytes": c.Int("peak_used_in_bytes"),
+ },
+ "peak_max": s.Object{
+ "bytes": c.Int("peak_max_in_bytes"),
+ },
+ }
+
  totalMemoryPressureSchema = s.Schema{
  "primary": s.Object{
  "rejections": c.Int("primary_rejections"),