[doc] Add -maxuploadtarget release notes
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@ -4,3 +4,21 @@ release-notes at release time)
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Notable changes
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===============
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Reduce upload traffic
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---------------------
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A major part of the outbound traffic is caused by serving historic blocks to
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other nodes in initial block download state.
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It is now possible to reduce the total upload traffic via the `-maxuploadtarget`
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parameter. This is *not* a hard limit but a threshold to minimize the outbound
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traffic. When the limit is about to be reached, the uploaded data is cut by not
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serving historic blocks (blocks older than one week).
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Moreover, any SPV peer is disconnected when they request a filtered block.
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This option can be specified in MiB per day and is turned off by default
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(`-maxuploadtarget=0`).
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The recommended minimum is 144 * MAX_BLOCK_SIZE (currently 144MB) per day.
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A more detailed documentation about keeping traffic low can be found in
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[/doc/reducetraffic.md](/doc/reducetraffic.md).
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