chore: import upstream snapshot with attribution

home/docs/start/postgresql-change.md

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+---
+id: postgresql-change  
+title: Use PostgreSQL Replace H2 Database to Store Metadata(Recommended)     
+sidebar_label: Meta Store PostgreSQL (Recommended)
+---
+
+PostgreSQL is an RDBMS emphasizing extensibility and SQL compliance. In addition to default built-in H2 database, Apache HertzBeat™ allows you to use PostgreSQL to store structured relational data such as monitoring information, alarm information and configuration information.
+
+> If you have a PostgreSQL environment, you can skip directly to the database creation step.
+
+## Install PostgreSQL via Docker
+
+1. Download and install the Docker environment
+   Docker tools download refer to [Docker official document](https://docs.docker.com/get-docker/)。
+   After the installation you can check if the Docker version normally output at the terminal.
+
+   ```shell
+   $ docker -v
+   Docker version 20.10.12, build e91ed57
+   ```
+
+2. Install PostgreSQL with Docker
+
+   ```shell
+   docker run -d --name postgresql -p 5432:5432 -e POSTGRES_USER=root -e POSTGRES_PASSWORD=123456 -e TZ=Asia/Shanghai postgres:15       
+   ```
+
+   use```$ docker ps```to check if the database started successfully
+
+### Database creation
+
+1. Enter postgreSQL or use the client to connect postgreSQL service
+
+   ```shell
+   su - postgres
+   psql
+   ```
+
+2. Create database named hertzbeat
+
+   ```sql
+   CREATE DATABASE hertzbeat;
+   ```
+
+3. Check if hertzbeat database has been successfully created
+
+   ```sql
+   SELECT * FROM pg_database where datname='hertzbeat';
+   ```
+
+### Modify hertzbeat's configuration file application.yml and switch data source
+
+1. Configure HertzBeat's configuration file
+   Modify `hertzbeat/config/application.yml` configuration file
+   Note⚠️The docker container way need to mount application.yml file locally, while you can use installation package way to unzip and modify `hertzbeat/config/application.yml`  
+   Replace `spring.database` data source parameters, URL account and password.
+
+```yaml
+spring:
+  datasource:
+    driver-class-name: org.h2.Driver
+    username: sa
+    password: 123456
+    url: jdbc:h2:./data/hertzbeat;MODE=MYSQL
+    hikari:
+      max-lifetime: 120000
+
+  jpa:
+    show-sql: false
+    database: h2
+    hibernate:
+      ddl-auto: update
+    properties:
+      hibernate:
+        dialect: org.hibernate.dialect.H2Dialect
+        format_sql: true
+```
+
+Specific replacement parameters are as follows and you need to configure account, ip, port according to the postgresql environment:
+
+```yaml
+spring:
+  datasource:
+    driver-class-name: org.postgresql.Driver
+    username: root
+    password: 123456
+    url: jdbc:postgresql://postgresql:5432/hertzbeat
+    hikari:
+      max-lifetime: 120000
+  jpa:
+    show-sql: false
+    database: postgresql
+    hibernate:
+      ddl-auto: update
+    properties:
+      hibernate:
+        dialect: org.hibernate.dialect.PostgreSQLDialect
+        format_sql: true
+```
+
+> Note: The above applies to the method of downloading and installing the package. For local data source switching, simply complete the [Database creation](./postgresql-change#database-creation) and modify the configuration in `hertzbeat-startup/src/main/resources/application.yml`.
+
+**Start HertzBeat  visit [http://ip:1157/](http://ip:1157/) on the browser  You can use HertzBeat monitoring alarm, default account and password are admin/hertzbeat**