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Applied changes from contribution PR merged for 1.0 (#399)
* Applied changes from contribution PR merged for 1.0
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‎docs/compare.md‎

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There are multiple ways to deploy and manage PostgreSQL in Kubernetes. Here we will focus on comparing the following open source solutions:
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* [Crunchy Data PostgreSQL Operator (PGO) :octicons-link-external-16:](https://github.com/CrunchyData/postgres-operator)
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* [CloudNative PG :octicons-link-external-16:](https://github.com/cloudnative-pg/cloudnative-pg) from Enterprise DB
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* [CloudNative PG :octicons-link-external-16:](https://github.com/cloudnative-pg/cloudnative-pg), vendor-neutral, originally created by Enterprise DB
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* [Stackgres :octicons-link-external-16:](https://github.com/ongres/stackgres) from OnGres
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* [Zalando Postgres Operator :octicons-link-external-16:](https://github.com/zalando/postgres-operator)
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* [Percona Operator for PostgreSQL :octicons-link-external-16:](https://github.com/percona/percona-postgresql-operator/)
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## Generic
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| Feature/Product | Percona Operator for PostgreSQL | Stackgres | CrunchyData | CloudNativePG (EDB) | Zalando |
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| Feature/Product | Percona Operator for PostgreSQL | Stackgres | CrunchyData | CloudNativePG | Zalando |
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|------------------------|:---------------------------:|:---------------------------:|:---------------------------------------------------:|:---------------------------:|:-------:|
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| Open-source license | Apache 2.0 | AGPL 3 | Apache 2.0, but images are under Developer Program | Apache 2.0 | MIT |
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| PostgreSQL versions | 13 - 18 | 14 - 18 | 14 - 18 | 14 - 18 | 13 - 17 |
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## Maintenance
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| Feature/Product | Percona Operator for PostgreSQL | Stackgres | CrunchyData | CloudNativePG (EDB) | Zalando |
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| Feature/Product | Percona Operator for PostgreSQL | Stackgres | CrunchyData | CloudNativePG | Zalando |
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|------------------|:-----------------------:|:-----------------------:|:-----------------------:|:-----------------------:|:-----------------------------:|
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| Operator upgrade | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |
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| Database upgrade | Automated and safe | Automated and safe | Manual | Manual | Manual |
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## PostgreSQL topologies
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| Feature/Product | Percona Operator for PostgreSQL | Stackgres | CrunchyData | CloudNativePG (EDB) | Zalando |
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| Feature/Product | Percona Operator for PostgreSQL | Stackgres | CrunchyData | CloudNativePG | Zalando |
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|--------------------|:-------------------:|:---------:|:-----------:|:-------------------:|:-------:|
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| Warm standby | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |
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| Hot standby | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |
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| Connection pooling | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |
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| Delayed replica | :no_entry_sign: | :no_entry_sign: | :no_entry_sign: | :no_entry_sign: | :no_entry_sign: |
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| Delayed replica | :no_entry_sign: | :no_entry_sign: | :no_entry_sign: | :white_check_mark: | :no_entry_sign: |
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## Backups
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| Feature/Product | Percona Operator for PostgreSQL | Stackgres | CrunchyData | CloudNativePG (EDB) | Zalando |
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| Feature/Product | Percona Operator for PostgreSQL | Stackgres | CrunchyData | CloudNativePG | Zalando |
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|-------------------|:-------------------------------:|:---------:|:-----------:|:-------------------:|:-------:|
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| Scheduled backups | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |
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| WAL archiving | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |
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## Monitoring
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| Feature/Product | Percona Operator for PostgreSQL | Stackgres | CrunchyData | CloudNativePG (EDB) | Zalando |
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| Feature/Product | Percona Operator for PostgreSQL | Stackgres | CrunchyData | CloudNativePG | Zalando |
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|-----------------|:---------------------------------:|:-------------------------------------:|:------------------------------:|:-------------------------------------:|:--------:|
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| Solution | Percona Monitoring and Management and sidecars | Exposing metrics in Prometheus format | Prometheus stack and pgMonitor | Exposing metrics in Prometheus format | Sidecars |
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| Solution | Percona Monitoring and Management and sidecars | Exposing metrics in Prometheus format | Prometheus stack and pgMonitor | Prometheus metrics & Grafana dashboard | Sidecars |
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## Miscellaneous
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| Feature/Product | Percona Operator for PostgreSQL | Stackgres | CrunchyData | CloudNativePG (EDB) | Zalando |
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| Feature/Product | Percona Operator for PostgreSQL | Stackgres | CrunchyData | CloudNativePG | Zalando |
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|--------------------------------------|:-------------------------------:|:---------------------:|:---------------------:|:---------------------:|:---------------------:|
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| Customize PostgreSQL configuration | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |
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| Sidecar containers for customization | :white_check_mark: | :no_entry_sign: | :white_check_mark: | :no_entry_sign: | :white_check_mark: |

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