Added graphs for:
- Absolute Disk Latency
- Physical Device Latency
- Kernel Device Latency
- Maximum Queue Depth
- Disk Queue Command Latency
- Queue Read/Write Latency
- SCSI-bus Reset Commands
- Disk Commands
- Disk Read/Write Commands
- Number of Disk Read/Writes
- Disk Read/Write Rate
- Datastore Total Latency (Kernel + Device)