There are currently two separate datasources for InfluxDB in Grafana: InfluxDB 0.8.x and InfluxDB 0.9.x.
Grafana ships with very a feature data source plugin for InfluxDB. Supporting a feature rich query editor, annotation and templating queries.
The API and capabilities of InfluxDB 0.9.x are completely different from InfluxDB 0.8.x which is why Grafana handles
them as different data sources.
InfluxDB 0.9 is rapidly evolving and we continue to track its API. InfluxDB 0.8 is no longer maintained by InfluxDB Inc, but we provide support as a convenience to existing users.