README
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PostgreSQL monitoring with Netdata
PostgreSQL, also known as Postgres, is a free and open-source relational database management system emphasizing extensibility and SQL compliance.
This module monitors one or more Postgres servers, depending on your configuration.
Requirements
- PostgreSQL v9.4+
- User with granted
pg_monitororpg_read_all_statbuilt-in role.
Metrics
All metrics have "postgres." prefix.
| Metric | Scope | Dimensions | Units |
|---|---|---|---|
| connections_utilization | global | used | percentage |
| connections_usage | global | available, used | connections |
| checkpoints | global | scheduled, requested | checkpoints/s |
| checkpoint_time | global | write, sync | milliseconds |
| bgwriter_buffers_alloc | global | allocated | B/s |
| bgwriter_buffers_written | global | checkpoint, backend, clean | B/s |
| bgwriter_maxwritten_clean | global | maxwritten | events/s |
| bgwriter_buffers_backend_fsync | global | fsync | operations/s |
| wal_writes | global | writes | B/s |
| wal_files | global | written, recycled | files |
| wal_archive_files | global | ready, done | files/s |
| autovacuum_workers | global | analyze, vacuum_analyze, vacuum, vacuum_freeze, brin_summarize | workers |
| percent_towards_emergency_autovacuum | global | emergency_autovacuum | percentage |
| percent_towards_txid_wraparound | global | txid_wraparound | percentage |
| oldest_transaction_xid | global | xid | xid |
| catalog_relation_count | global | ordinary_table, index, sequence, toast_table, view, materialized_view, composite_type, foreign_table, partitioned_table, partitioned_index | relations |
| catalog_relation_size | global | ordinary_table, index, sequence, toast_table, view, materialized_view, composite_type, foreign_table, partitioned_table, partitioned_index | B |
| uptime | global | uptime | seconds |
| replication_standby_app_wal_delta | standby application | sent_delta, write_delta, flush_delta, replay_delta | B |
| replication_standby_app_wal_lag | standby application | write_lag, flush_lag, replay_lag | seconds |
| replication_standby_app_wal_lag | replication slot | wal_keep, pg_replslot_files | files |
| db_transactions_ratio | database | committed, rollback | percentage |
| db_transactions | database | committed, rollback | transactions/s |
| db_connections_utilization | database | used | percentage |
| db_connections | database | connections | connections |
| db_buffer_cache_hit_ratio | database | hit, miss | percentage |
| db_blocks_read | database | memory, disk | blocks/s |
| db_rows_read_ratio | database | returned, fetched | percentage |
| db_rows_read | database | returned, fetched | rows/s |
| db_rows_written | database | inserted, deleted, updated | rows/s |
| db_conflicts | database | conflicts | queries/s |
| db_conflicts_stat | database | tablespace, lock, snapshot, bufferpin, deadlock | queries/s |
| db_deadlocks | database | deadlocks | deadlocks/s |
| db_locks_held | database | access_share, row_share, row_exclusive, share_update, share, share_row_exclusive, exclusive, access_exclusive | locks |
| db_locks_awaited | database | access_share, row_share, row_exclusive, share_update, share, share_row_exclusive, exclusive, access_exclusive | locks |
| db_temp_files | database | written | files/s |
| db_temp_files_data | database | written | B/s |
| db_size | database | size | B |
Configuration
Edit the go.d/postgres.conf configuration file using edit-config from the
Netdata config directory, which is typically at /etc/netdata.
cd /etc/netdata # Replace this path with your Netdata config directory
sudo ./edit-config go.d/postgres.conf
DSN (Data Source Name) may either be in URL format or key=word format. See Connection Strings for details.
jobs:
- name: local
dsn: 'postgres://postgres:postgres@127.0.0.1:5432/postgres'
- name: local
dsn: 'host=/var/run/postgresql dbname=postgres user=postgres'
- name: remote
dsn: 'postgres://postgres:postgres@203.0.113.10:5432/postgres'
For all available options see module configuration file.
Troubleshooting
To troubleshoot issues with the postgres collector, run the go.d.plugin with the debug option enabled. The output
should give you clues as to why the collector isn't working.
First, navigate to your plugins directory, usually at /usr/libexec/netdata/plugins.d/. If that's not the case on your
system, open netdata.conf and look for the setting plugins directory. Once you're in the plugin's directory, switch
to the netdata user.
cd /usr/libexec/netdata/plugins.d/
sudo -u netdata -s
You can now run the go.d.plugin to debug the collector:
./go.d.plugin -d -m postgres
Documentation
Source Files