PG Monitoring review Query analysis, physical level

Related to the current monitoring we need to review:

• ⛔ Query analysis, physical level – CPU and filesystem – based on pg_stat_kcache
  • ⛔ Top-N by number of bytes read/written to disk
  • ⛔ Top-N by user and system CPU time
  • ⛔ Top-N by voluntary and involuntary context switches
  • ⛔ Top-N by page reclaims and page faults

Acceptance criteria:

• Fix the metrics and the dashboard