Docs: Adds section on Querying Logs for InfluxDB (#17726)

Fixes #17715

docs/sources/features/datasources/influxdb.md

@@ -117,6 +117,26 @@ You can switch to raw query mode by clicking hamburger icon and then `Switch edi
 You can remove the group by time by clicking on the `time` part and then the `x` icon. You can
 change the option `Format As` to `Table` if you want to show raw data in the `Table` panel.
 
+## Querying Logs (BETA)
+
+> Only available in Grafana v6.3+.
+
+Querying and displaying log data from InfluxDB is available via [Explore](/features/explore).
+
+![](/img/docs/v63/influxdb_explore_logs.png)
+
+Select the InfluxDB data source, change to Logs using the Metrics/Logs switcher,
+and then use the `Measurements/Fields` button to display your logs.
+
+### Log Queries
+
+The Logs Explorer (the `Measurements/Fields` button) next to the query field shows a list of measurements and fields. Choose the desired measurement that contains your log data and then choose which field Explore should use to display the log message.
+
+Once the result is returned, the log panel shows a list of log rows and a bar chart where the x-axis shows the time and the y-axis shows the frequency/count.
+
+### Filter search
+
+To add a filter click the plus icon to the right of the `Measurements/Fields` button or a condition. You can remove tag filters by clicking on the first select and choosing `--remove filter--`.
 
 ## Templating