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README file updated.

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Ibrar Ahmed
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![pg11-test](https://github.com/percona/pg_stat_monitor/workflows/pg11-test/badge.svg) ![pg11-test](https://github.com/percona/pg_stat_monitor/workflows/pg11-test/badge.svg)
![pg12-test](https://github.com/percona/pg_stat_monitor/workflows/pg12-test/badge.svg) ![pg12-test](https://github.com/percona/pg_stat_monitor/workflows/pg12-test/badge.svg)
![pg13-test](https://github.com/percona/pg_stat_monitor/workflows/pg13-test/badge.svg) ![pg13-test](https://github.com/percona/pg_stat_monitor/workflows/pg13-test/badge.svg)
![pg14-test](https://github.com/percona/pg_stat_monitor/workflows/pg14-test/badge.svg)
## What is pg_stat_monitor? ## What is pg_stat_monitor?
The **pg_stat_monitor** is a **PostgreSQL Query Performance Monitoring** tool, based on PostgreSQL's contrib module ``pg_stat_statements``. PostgreSQL’s pg_stat_statements provides the basic statistics, which is sometimes not enough. The major shortcoming in pg_stat_statements is that it accumulates all the queries and their statistics and does not provide aggregated statistics nor histogram information. In this case, a user needs to calculate the aggregate which is quite expensive. The **pg_stat_monitor** is a **PostgreSQL Query Performance Monitoring** tool, based on PostgreSQL's contrib module ``pg_stat_statements``. PostgreSQL’s pg_stat_statements provides the basic statistics, which is sometimes not enough. The major shortcoming in pg_stat_statements is that it accumulates all the queries and their statistics and does not provide aggregated statistics nor histogram information. In this case, a user needs to calculate the aggregate which is quite expensive.