Monitoring checklist

Monitoring checklist (dashboard 1):

1. TPS and (optional but also desired) QPS
2. Latency (query duration) — at least average. Better: histogram, percentiles
3. Connections (sessions) — stacked graph of session counts by state (first of all: active and idle-in-transaction; also interesting: idle, others) and how far the sum is from max_connection (+pool size for PgBouncer).
4. Longest transactions (max transaction age or top-n transactions by age), excluding autovacuum activity
5. Commits vs rollbacks — how many transactions are rolled back
6. Transactions left till transaction ID wraparound
7. Replication lags / bytes in replication slot / unused replication slots
8. Count of WALs waiting to be archived (archiving lag)
9. WAL generation rates
10. Locks and deadlocks
11. Basic query analysis graph (top-n by total_time or by mean_time?)
12. Basic wait event analysis (a.k.a. “active session analysis” or “performance insights”)

And links to a few things we mentioned: 

• Postgres monitoring review checklist (community document) 
• pgstats.dev 
• Improving Postgres Connection Scalability: Snapshots (blog post by Andres Freund) 
• Transaction ID Wraparound in Postgres (blog post by David Cramer) 
• Subtransactions Considered Harmful (blog post by Nikolay)
• datadoghq.com  
• pgwatch2 (Postgres.ai Edition) 

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