Adds isolated netstats for replication. (#10062)
The amount of `server.stat_net_output_bytes/server.stat_net_input_bytes`
is actually the sum of replication flow and users' data flow.
It may cause confusions like this:
"Why does my server get such a large output_bytes while I am doing nothing? ".
After discussions and revisions, now here is the change about what this
PR brings (final version before merge):
- 2 server variables to count the network bytes during replication,
including fullsync and propagate bytes.
- `server.stat_net_repl_output_bytes`/`server.stat_net_repl_input_bytes`
- 3 info fields to print the input and output of repl bytes and instantaneous
value of total repl bytes.
- `total_net_repl_input_bytes` / `total_net_repl_output_bytes`
- `instantaneous_repl_total_kbps`
- 1 new API `rioCheckType()` to check the type of rio. So we can use this
to distinguish between diskless and diskbased replication
- 2 new counting items to keep network statistics consistent between master
and slave
- rdb portion during diskless replica. in `rdbLoadProgressCallback()`
- first line of the full sync payload. in `readSyncBulkPayload()`
Co-authored-by:
Oran Agra <oran@redislabs.com>
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