feat: Compute target metrics

[edgarrmondragon]

Feature scope

Targets

Description

We have a few metrics computed for taps:

• Record counter
• Request counter
• Sync timer
• Request timer

It would be interesting to similarly generate some metrics for targets. A few that come to mind:

• Message counter (tagged by message type and stream at least)
• Sync timer
• Record counter

This would allow developers (and platforms like Meltano) to monitor and correlate tap and target metrics.

[tayloramurphy]

It would probably be good to do a record calculator for targets too. If users filter rows from a mapper having the counts on both sides is useful!

[stale]

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[edgarrmondragon]

Still relevant