> ## Documentation Index > Fetch the complete documentation index at: https://docs.fly.io/llms.txt > Use this file to discover all available pages before exploring further. # Monitor a Postgres App Important: We are not able to provide support or guidance for unmanaged Postgres. We now offer [Fly.io Managed Postgres](/mpg) , our fully-managed database service that handles all aspects of running production PostgreSQL databases. ## App Status You can use `fly status` to see a list of VMs and an overview of their status. The output for each VM includes its role within the cluster. ``` $ fly status --app test-pg ID STATE ROLE REGION HEALTH CHECKS IMAGE CREATED UPDATED e784079b449483 started leader iad 3 total, 3 passing flyio/postgres:14.4 (v0.0.26) 2022-09-26T16:58:50Z 2022-09-26T16:59:04Z 1781957c525989 started replica iad 3 total, 3 passing flyio/postgres:14.4 (v0.0.26) 2022-09-26T17:05:25Z 2022-09-26T17:05:38Z ``` To view the status of an individual Machine in more detail: ``` $ fly machine status e784079b449483 --app test-pg Machine ID: e784079b449483 Instance ID: 01GDXBSCZ0TSKA40K478CQ0P26 State: started VM ID = e784079b449483 Instance ID = 01GDXBSCZ0TSKA40K478CQ0P26 State = started Image = flyio/postgres:14.4 (v0.0.26) Name = nameless-star-9637 Private IP = fdaa:0:2e26:a7b:775b:4009:bf60:2 Region = iad Process Group = Memory = 256 CPUs = 1 Created = 2022-09-26T16:58:50Z Updated = 2022-09-26T16:59:04Z Command = Volume = vol_w1q85vgg998vzdxe Event Logs STATE EVENT SOURCE TIMESTAMP INFO started start flyd 2022-09-26T11:59:04.889-05:00 created launch user 2022-09-26T11:58:50.789-05:00 ``` ## Checks To view a list of health checks for a Fly Postgres app, run: ``` fly checks list -a test-pg Health Checks for shaun-pg-mach-test NAME | STATUS | MACHINE | LAST UPDATED | OUTPUT -------*---------*----------------*--------------*----------------------------------------------------------------------------- pg | passing | 1781957c525989 | 3m49s ago | 200 OK Output: "[✓] | | | | | | | | transactions: readonly (569.43µs)\n[✓] | | | | | | | | replication: syncing from fdaa:0:2e26:a7b:775b:4009:bf60:2 (144.39µs)\n[✓] | | | | | | | | connections: 6 used, 3 reserved, 300 max (6.3ms)"[✓] | | | | | | | | vm | passing | 1781957c525989 | 3m21s ago | 200 OK Output: "[✓] | | | | | | | | checkDisk: 860.8 MB (87.1%) free space on /data/ (520.24µs)\n[✓] | | | | | | | | checkLoad: load averages: 0.00 0.00 0.00 (350.76µs)\n[✓] | | | | | | | | memory: system spent 0s of the last 60s waiting on memory (54.97µs)\n[✓] | | | | | | | | cpu: system spent 930ms of the last 60s waiting on cpu (23.89µs)\n[✓] | | | | | | | | io: system spent 414ms of the last 60s waiting on io (20.02µs)"[✓] | | | | | | | | role | passing | 1781957c525989 | 3m53s ago | 200 OK Output: "replica"[✓] | | | | | | | | pg | passing | e784079b449483 | 10m9s ago | 200 OK Output: "[✓] | | | | | | | | transactions: read/write (157.2µs)\n[✓] | | | | | | | | connections: 9 used, 3 reserved, 300 max (3.7ms)"[✓] | | | | | | | | vm | passing | e784079b449483 | 10m49s ago | 200 OK Output: "[✓] | | | | | | | | checkDisk: 918.45 MB (93.0%) free space on /data/ (48.94µs)\n[✓] | | | | | | | | checkLoad: load averages: 0.00 0.00 0.00 (91.52µs)\n[✓] | | | | | | | | memory: system spent 0s of the last 60s waiting on memory (38.75µs)\n[✓] | | | | | | | | cpu: system spent 114ms of the last 60s waiting on cpu (16.94µs)\n[✓] | | | | | | | | io: system spent 210ms of the last 60s waiting on io (14.93µs)"[✓] | | | | | | | | role | passing | e784079b449483 | 10m19s ago | 200 OK Output: "leader"[✓] | | | | | | | | ``` ## Logs Fly Postgres apps run several processes inside each VM, including Postgres, Stolon keeper, Stolon sentinel, HAProxy, and postgres\_export. Each of those processes redirect STDOUT and STDERR to logs which you can view with `fly logs`. ## Metrics Fly Postgres apps export metrics to Prometheus which can be seen in the Metrics UI or queried from Grafana. The available metrics are ``` pg_stat_activity_count pg_stat_activity_max_tx_duration pg_stat_archiver_archived_count pg_stat_archiver_failed_count pg_stat_bgwriter_buffers_alloc pg_stat_bgwriter_buffers_backend_fsync pg_stat_bgwriter_buffers_backend pg_stat_bgwriter_buffers_checkpoint pg_stat_bgwriter_buffers_clean pg_stat_bgwriter_checkpoint_sync_time pg_stat_bgwriter_checkpoint_write_time pg_stat_bgwriter_checkpoints_req pg_stat_bgwriter_checkpoints_timed pg_stat_bgwriter_maxwritten_clean pg_stat_bgwriter_stats_reset pg_stat_database_blk_read_time pg_stat_database_blk_write_time pg_stat_database_blks_hit pg_stat_database_blks_read pg_stat_database_conflicts_confl_bufferpin pg_stat_database_conflicts_confl_deadlock pg_stat_database_conflicts_confl_lock pg_stat_database_conflicts_confl_snapshot pg_stat_database_conflicts_confl_tablespace pg_stat_database_conflicts pg_stat_database_deadlocks pg_stat_database_numbackends pg_stat_database_stats_reset pg_stat_database_tup_deleted pg_stat_database_tup_fetched pg_stat_database_tup_inserted pg_stat_database_tup_returned pg_stat_database_tup_updated pg_stat_database_xact_commit pg_stat_database_xact_rollback pg_stat_replication_pg_current_wal_lsn_bytes pg_stat_replication_pg_wal_lsn_diff pg_stat_replication_reply_time pg_replication_lag pg_database_size_bytes ```