| Area                 | What to show                                 | Why it matters                              |
| -------------------- | -------------------------------------------- | ------------------------------------------- |
| Node status          | Up/down, PostgreSQL service state, uptime    | Tells you whether the node is reachable     |
| CPU                  | Current %, load average                      | Detects compute saturation                  |
| Memory               | Used/free RAM, swap                          | Finds memory pressure                       |
| Disk                 | Used %, free GB, IOPS, read/write latency    | Disk issues can kill DB performance         |
| Network              | RX/TX, latency, packet loss                  | Important for distributed replication       |
| Connections          | Active, idle, total, max connections         | Prevents connection exhaustion              |
| Sessions             | Current sessions, user, DB, client IP        | Shows who is connected                      |
| Transactions         | TPS, commits, rollbacks                      | Measures workload and failures              |
| Query performance    | Avg query time, slow queries, top queries    | Finds performance bottlenecks               |
| Long-running queries | Query, PID, runtime, user                    | Long queries often cause locks/bloat        |
| Locks                | Waiting locks, blocking PID, blocked query   | Critical for troubleshooting stalls         |
| Deadlocks            | Count and recent deadlocks                   | Shows transaction contention                |
| Cache                | Buffer cache hit ratio                       | Indicates memory efficiency                 |
| Tables               | Size, rows, scans, inserts, updates, deletes | Shows table activity                        |
| Indexes              | Usage, unused indexes, index size            | Helps optimize queries/storage              |
| WAL                  | WAL generated, retained, archived            | Important for replication and recovery      |
| Checkpoints          | Checkpoint frequency/duration                | Too many checkpoints hurt performance       |
| Vacuum               | Last vacuum/autovacuum, failures             | Prevents table bloat                        |
| Analyze              | Last analyze, stats freshness                | Needed for query planner accuracy           |
| Bloat                | Table/index bloat                            | Excess bloat wastes space and slows queries |
| Replication          | Status, lag, slot status                     | Essential for HA/multi-master               |
| Replication slots    | Active/inactive, retained WAL                | Inactive slots can fill disk                |
| Backup               | Last backup, status, duration                | Tells you whether recovery is possible      |
| Disk growth          | Database/table/WAL growth trend              | Helps capacity planning                     |
| Errors               | PostgreSQL errors/warnings                   | Shows immediate operational issues          |
| Security             | Failed logins, unusual connections           | Useful for security monitoring              |






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