v0.8.0

* Add a build info metric (prometheus-community#323)
* Re-add pg_stat_bgwriter metrics which were accidentally removed in the previous version. (resolves prometheus-community#336)
* Export pg_stat_archiver metrics (prometheus-community#324)
* Add support for 'DATA_SOURCE_URI_FILE' envvar.
* Resolve prometheus-community#329
* Added new field "master" to queries.yaml. (credit to @sfalkon)
  - If "master" is true, query will be call only on once database in instance
* Change queries.yaml for work with autoDiscoveryDatabases options (credit to @sfalkon)
  - added current database name to metrics because any database in cluster maybe have the same table names
  - added "master" field for query instance metrics.

v0.7.0

Introduces some more significant changes, hence the minor version bump in
such a short time frame.

* Rename pg_database_size to pg_database_size_bytes in queries.yml.
* Add pg_stat_statements to sample queries.yml file.
* Add support for optional namespace caching. (prometheus-community#319)
* Fix some autodiscovery problems (prometheus-community#314) (resolves prometheus-community#308)
* Yaml parsing refactor (prometheus-community#299)
* Don't stop generating fingerprint while encountering value with "=" sign (prometheus-community#318)
  (may resolve problems with passwords and special characters).

v0.6.0

* Add SQL for grant connect (prometheus-community#303)
* Expose pg_current_wal_lsn_bytes (prometheus-community#307)
* [minor] fix landing page content-type (prometheus-community#305)
* Updated lib/pg driver to 1.2.0 in order to support stronger SCRAM-SHA-256 authentication. This drops support for Go < 1.11 and PostgreSQL < 9.4. (prometheus-community#304)
* Provide more helpful default values for tables that have never been vacuumed (prometheus-community#310)
* Add retries to getServer() (prometheus-community#316)
* Fix pg_up metric returns last calculated value without explicit resetting (prometheus-community#291)
* Discover only databases that are not templates and allow connections (prometheus-community#297)
* Add --exclude-databases option (prometheus-community#298)

v0.5.1

* Add application_name as a label for pg_stat_replication metrics (prometheus-community#285).

v0.5.0

It's been far too long since I've done a release and we have a lot of accumulated changes.

* Docker image now runs as a non-root user named "postgres_exporter"
* Add `--auto-discover-databases` option, which automatically discovers and scrapes all databases.
* Add support for boolean data types as metrics
* Replication lag is now expressed as a float and not truncated to an integer.
* When default metrics are disabled, no version metrics are collected anymore either.
* BUGFIX: Fix exporter panic when postgres server goes down.
* Add support for collecting metrics from multiple servers.
* PostgreSQL 11 is now supported in the integration tests.

v0.4.7

* Added a query for v9.1 pg_stat_activity.
* Add `--constantLabels` flag to allow applying fixed constant labels to metrics.
* queries.yml: dd pg_statio_user_tables.
* Support 'B' suffix in units.

v0.4.6

* Fix issue prometheus-community#173 - 32 and 64mb unit sizes were not supported in pg_settings.

v0.4.5

* Add commandline flag to disable default metrics (thanks @hsun-cnnxty)