Update BigQuerySinkMetrics for StreamingInserts.

[JayajP]

Update the following metrics after we insert a batch of rows using BigQuery's InsertAll RPC.

1. RowsAppendedCount Counter

Tracks the status of BigQuery Rows after the batch of InsertAll RPCs is completed.

Metric has labels the following labels:

• RowStatus: Status of the BigQuery rows after , one of SUCCESSFUL, RETRIED, FAILED
• RpcStatus: Rpc Status
• TableId: 'datasets/{ }/tables/{ }' that the rows are sent to.

Rows are updated based on the following criteria.

• Rows that are successfully inserted will have their RowStatus set to successful.
• Rows that have to be retried because the RPC failed will have their RowStatus set to RETRIED and RpcStatus set to the failed RPC's status.
• Rows might fail to be inserted even when the InsertAll RPC succeeds. These rows will have their RowStatus set to RETRIED and RpcStatus set to INTERNAL.
• Rows that fail to be inserted will RowStatus set to RETRIED and RpcStatus set to INTERNAL.

2. RpcRequests Counter

Tracks the Rpc Status of the InsertAll Rpc.

Metric has labels the following labels:

• Method: BigQuery sink method. Will be STREAMING_INSERTS for these metrics.
• RpcStatus: Rpc Status
• TableId: 'datasets/{ }/tables/{ }' that the rows are sent to.

3. RpcLatency Histogram:

Tracks the Rpc Latency of the InsertAll Rpc.

Metric has labels the following labels:

• Method: BigQuery sink method. Will be STREAMING_INSERTS for these metrics.

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[JayajP]

R: @m-trieu

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[JayajP]

Thanks for the review Martin, switched StreamingInsertsResults to an AutoValue class, made the instance-variables private and added some update methods to update the instance-variables.