The most common problems are related to the query & response from you data source. Even if it looks
like a bug or visualization issue in Grafana it is 99% of time a problem with the data source query or
the data source response.
To check this you should use Query Inspector. Query Inspector shows query requests and responses.
![](/img/docs/v45/query_inspector.png)
A guide on how to use it you can find [here](https://community.grafana.com/t/using-grafanas-query-inspector-to-troubleshoot-issues/2630).
To check this you should use Query Inspector (new in Grafana v4.5). The query Inspector shows query requests and responses.
<!---So make sure to check the query sent and the raw response, learn how in this guide: [How to troubleshoot metric query issues](https://community.grafana.com/t/how-to-troubleshoot-metric-query-issues/50)--->
For more on the query insector read [this guide here](https://community.grafana.com/t/using-grafanas-query-inspector-to-troubleshoot-issues/2630). For
older versions of Grafana read the [how troubleshoot metric query issue](https://community.grafana.com/t/how-to-troubleshoot-metric-query-issues/50/2) article.