Anton Tolchanov cd9cf93de6 wgengine/netstack: expose TCP forwarder drops via clientmetrics
- add a clientmetric with a counter of TCP forwarder drops due to the
  max attempts;
- fix varz metric types, as they are all counters.

Updates #8210

Signed-off-by: Anton Tolchanov <anton@tailscale.com>
2024-02-26 17:32:34 +00:00
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