[feature](write)add metrics for flink load data

[vinlee19]

Proposed changes

When you import data to Apache Doris in real time , you can observe the import of some metrics in Flink webui metrics. The metrics are a concatenation of table, and Flink metrics, e.g. table_1_totalFlushLoadBytes. Below is a description of how to use several metrics:

Name	Metric Type	Description
totalFlushLoadBytes	Counter	Number of bytes imported.
flushTotalNumberRows	Counter	Number of rows imported for total processing
totalFlushLoadedRows	Counter	Number of rows successfully imported.
totalFlushTimeMs	Counter	Number of Import completion time. Unit milli
totalFlushSucceededNumber	Counter	Number of times that the data-batch been successfully imported.
totalFlushFailedNumber	Counter	Number of times that the data-batch been failed.
totalFlushFilteredRows	Counter	Number of rows that do not qualify for data quality flushed
totalFlushUnselectedRows	Counter	Number of rows filtered by where condition flushed
beginTxnTimeMs	Histogram	The time cost for RPC to Fe to begin a transaction, Unit milliseconds.
putDataTimeMs	Histogram	The time cost for RPC to Fe to get a stream load plan, Unit milliseconds.
readDataTimeMs	Histogram	Read data time, Unit milliseconds.
writeDataTimeMs	Histogram	Write data time, Unit milliseconds.
commitAndPublishTimeMs	Histogram	The time cost for RPC to Fe to commit and publish a transaction, Unit milliseconds.
loadTimeMs	Histogram	Import completion time

The monitoring metrics for Flink write are shown below:

Problem Summary:

Describe the overview of changes.

Checklist(Required)

1. Does it affect the original behavior: (Yes/No/I Don't know)
2. Has unit tests been added: (Yes/No/No Need)
3. Has document been added or modified: (Yes/No/No Need)
4. Does it need to update dependencies: (Yes/No)
5. Are there any changes that cannot be rolled back: (Yes/No)

Further comments

If this is a relatively large or complex change, kick off the discussion at [email protected] by explaining why you chose the solution you did and what alternatives you considered, etc...

[JNSimba]

Do we need to add subTaskId? It seems to be there by default?

[JNSimba]

Is getLoadTimeMs also a counter-type metric?

[vinlee19]

There are two metric type for LoadTimeMs: Counter and Historgram ,

[JNSimba]

Thanks for the @vinlee19 . Can you post some final monitoring screenshots?

[vinlee19]

Thanks for the @vinlee19 . Can you post some final monitoring screenshots?

Yeah,I will post the final monitoring screenshots later.

[JNSimba]

LGTM