[CELEBORN-1706] Use bytes(IEC) unit instead of bytes(SI) for size related metrics in prometheus dashboard

[turboFei]

What changes were proposed in this pull request?

Use unit bytes(IEC)(decbytes, 1,024 bytes in a kibibyte ) for below 18 metrics(disk and memory related) instead of bytes(SI)(bytes, 1,000 bytes in a kilobyte).

• metrics_DeviceCelebornTotalBytes_Value
• metrics_DeviceCelebornFreeBytes_Value
• metrics_PartitionSize_Value
• metrics_ActiveShuffleSize_Value
• metrics_NettyMemory_Value
• metrics_DiskBuffer_Value
• metrics_push_usedHeapMemory_Value
• metrics_push_usedDirectMemory_Value
• metrics_fetch_usedHeapMemory_Value
• metrics_fetch_usedDirectMemory_Value
• metrics_replicate_usedHeapMemory_Value
• metrics_replicate_usedDirectMemory_Value
• metrics_BufferStreamReadBuffer_Value
• metrics_SortMemory_Value
• metrics_DeviceOSFreeBytes_Value
• metrics_DeviceCelebornFreeBytes_Value
• metrics_diskBytesWritten_Value
• metrics_hdfsBytesWritten_Value

Also apply for 6 jvm metrics

• metrics_jvm_memory_heap_init_Value
• metrics_jvm_memory_non_heap_init_Value
• metrics_jvm_memory_total_init_Value
• metrics_jvm_memory_pools_init_Value
• metrics_jvm_direct_capacity_Value
• metrics_jvm_mapped_capacity_Value

Why are the changes needed?

Some size related metrics use bytes(IEC) and some use bytes(SI).

The main difference between bytes in the International System of Units (SI) and the International Electrotechnical Commission (IEC) is the number of bytes in a kilobyte:
SI: 1,000 bytes in a kilobyte
IEC: 1,024 bytes in a kibibyte

FYI: https://www.drupal.org/project/drupal/issues/1114538#:~:text=According%20to%20the%20SI%20standard,e.g.%20a%20stick%20of%20RAM.

celeborn/assets/grafana/celeborn-dashboard.json

Lines 5636 to 5699 in 4545cdc

	"expr": "metrics_DirectMemoryUsageRatio_Value{instance=~\"${instance}\"}",
	"legendFormat": "${baseLegend}",
	"instant": false,
	"range": true,
	"refId": "A"
	}
	],
	"title": "DirectMemoryUsageRatio",
	"type": "timeseries"
	},
	{
	"datasource": {
	"type": "prometheus",
	"uid": "${DS_PROMETHEUS}"
	},
	"fieldConfig": {
	"defaults": {
	"color": {
	"mode": "palette-classic"
	},
	"custom": {
	"axisCenteredZero": false,
	"axisColorMode": "text",
	"axisLabel": "",
	"axisPlacement": "auto",
	"barAlignment": 0,
	"drawStyle": "line",
	"fillOpacity": 0,
	"gradientMode": "none",
	"hideFrom": {
	"legend": false,
	"tooltip": false,
	"viz": false
	},
	"lineInterpolation": "linear",
	"lineWidth": 1,
	"pointSize": 5,
	"scaleDistribution": {
	"type": "linear"
	},
	"showPoints": "auto",
	"spanNulls": false,
	"stacking": {
	"group": "A",
	"mode": "none"
	},
	"thresholdsStyle": {
	"mode": "off"
	}
	},
	"mappings": [],
	"thresholds": {
	"mode": "absolute",
	"steps": [
	{
	"color": "green"
	},
	{
	"color": "red",
	"value": 80
	}
	]
	},
	"unit": "decbytes"

Does this PR introduce any user-facing change?

Yes, metrics unit changed.

How was this patch tested?

Not needed, we already use decbytes in the dashboard json.

[pan3793]

the idea lgtm, and do we have the contribution guide for modifying the grafana dashboard template? we should emphasis it there.

[turboFei]

do we have the contribution guide for modifying the grafana dashboard template?

No, currently it is a little difficult to add a new metrics.

[FMX]

I didn't know there was a difference between the SI and IEC. Thanks. LGTM.