Merge pull request #361 from adammetis/metis

Add Metis application and Metis blog

README.md

@@ -156,6 +156,7 @@ for `EXPLAIN`, that also provides performance tips (Commercial Software).
 * [PoWA](https://powa.readthedocs.io/en/latest/) - PostgreSQL Workload Analyzer gathers performance stats and provides real-time charts and graphs to help monitor and tune your PostgreSQL servers.
 * [pg_web_stats](https://github.com/kirs/pg_web_stats) - Web UI to view pg_stat_statements.
 * [TimescaleDB Tune](https://github.com/timescale/timescaledb-tune) - a program for tuning a TimescaleDB database to perform its best based on the host's resources such as memory and number of CPUs.
+* [Metis](https://www.metisdata.io/product/troubleshooting) - Metis provides observability and performance tuning for SQL databases including PostgreSQL. (Commercial Software)
 
 ### Utilities
 * [apgdiff](https://www.apgdiff.com/) - Compares two database dump files and creates output with DDL statements that can be used to update old database schema to new one.
@@ -255,6 +256,7 @@ for `EXPLAIN`, that also provides performance tips (Commercial Software).
 * [Michael Paquier's blog](https://paquier.xyz/)
 * [Robert Haas' blog](http://rhaas.blogspot.com/search/label/postgresql/)
 * [select * from depesz;](https://www.depesz.com/tag/postgresql/) - Hubert Lubaczewski's blog.
+* [Metis Blog](https://www.metisdata.io/blog) - Set of posts on PostgreSQL, SQL databases, performance, and tuning.
 
 ### Articles