Update README.md
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README.md
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README.md
@@ -50,6 +50,21 @@ Download source code from master branch and put `zabbix` directory into `<your g
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* **Important!** Change `Access` to `direct`!
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#### Trends support
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If you use patch for trends support ([ZBXNEXT-1193](https://support.zabbix.com/browse/ZBXNEXT-1193)), you don't need to do anything - trends support is enabled by default in `plugin.json` file:
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```
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"trends": true,
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"trendsFrom": "7d",
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```
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`trendsFrom` option define period when switch to trends from history.
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If you don't use trend patch, change `trends` to `false`:
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```
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"trends": false,
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```
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#### Note for Zabbix 2.2 or less
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Zabbix API (api_jsonrpc.php) before zabbix 2.4 don't allow cross-domain requests (CORS). And you can get HTTP error 412 (Precondition Failed).
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To fix it add this code to api_jsonrpc.php immediately after the copyright
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