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What Grafana version and what operating system are you using?
Current version of our grafana application is v6.7.1 (ca6d08d5cb) -
What are you trying to achieve?
Upgrade to latest version -
How are you trying to achieve it?
upgrade the version -
What happened?
Need the documetation for upgrading -
What did you expect to happen?
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Can you copy/paste the configuration(s) that you are having problems with?
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Did you receive any errors in the Grafana UI or in related logs? If so, please tell us exactly what they were.
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Did you follow any online instructions? If so, what is the URL?
welcome to the 
community @balajiselliappan
I’d recommend reviewing the release notes and changelog so you know what changes have happened since Grafana 6.7.1. You’ll also want to back up the database that grafana uses and plugins in case you want to roll back.
The upgrade guide walks through how to back up the database: