Introduce `SyncEvent::InitialPeers` message sent to new subscribers to
allow them correctly tracking sync peers. This resolves a race condition
described in
https://github.com/paritytech/polkadot-sdk/issues/6573#issuecomment-2563091343.

Fixes https://github.com/paritytech/polkadot-sdk/issues/6573.

---------

Co-authored-by: command-bot <>
Co-authored-by: Bastian Köcher <git@kchr.de>
(cherry picked from commit b4177a9f)

Backport #6864 into `stable2407` from alexggh.

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Co-authored-by: Alexandru Gheorghe <49718502+alexggh@users.noreply.github.com>

Backport #6696 into `stable2407` from alexggh.

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Signed-off-by: Alexandru Gheorghe <alexandru.gheorghe@parity.io>
Co-authored-by: Alexandru Gheorghe <49718502+alexggh@users.noreply.github.com>
Co-authored-by: Alexandru Gheorghe <alexandru.gheorghe@parity.io>

Backport #5311 into `stable2407` from Doordashcon.

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Co-authored-by: Doordashcon <jesse.chejieh@gmail.com>

Backport #6662 into `stable2407` from eskimor.

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Co-authored-by: eskimor <eskimor@users.noreply.github.com>
Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com>

Backport #6729 into `stable2407` from alexggh.

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Signed-off-by: Alexandru Gheorghe <alexandru.gheorghe@parity.io>
Co-authored-by: Alexandru Gheorghe <49718502+alexggh@users.noreply.github.com>
Co-authored-by: Alexandru Gheorghe <alexandru.gheorghe@parity.io>

Backport #6690 into `stable2407` from alexggh.

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Co-authored-by: Alexandru Gheorghe <49718502+alexggh@users.noreply.github.com>

Backport #6459 into `stable2407` from franciscoaguirre.

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Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>
Co-authored-by: Egor_P <egor@parity.io>

Backport #6506 into `stable2407` from Dinonard.

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Co-authored-by: Dino Pačandi <3002868+Dinonard@users.noreply.github.com>
Co-authored-by: Egor_P <egor@parity.io>

Backport #6540 into `stable2407` from Ank4n.

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Co-authored-by: Egor_P <egor@parity.io>

Backport #6080 into `stable2407` from franciscoaguirre.

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Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>
Co-authored-by: Egor_P <egor@parity.io>

Backport #6031 into `stable2407` from drewstone.

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Co-authored-by: drewstone <drewstone329@gmail.com>
Co-authored-by: Egor_P <egor@parity.io>

This PR accompanies #6672 to make backported changes consistent across
releases.

---------

Co-authored-by: Egor_P <egor@parity.io>

Backport #6603 into `stable2407` from lexnv.

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Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>

Backport #6579 into `stable2407` from bkontur.

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Co-authored-by: Branislav Kontur <bkontur@gmail.com>
Co-authored-by: Egor_P <egor@parity.io>

Backport #6645 into `stable2407` from bkontur.

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Co-authored-by: Branislav Kontur <bkontur@gmail.com>

Backport #6526 into `stable2407` from bkchr.

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Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: command-bot <>
Co-authored-by: Bastian Köcher <info@kchr.de>

This PR addresses an issue mentioned
[here](https://github.com/paritytech/polkadot-sdk/issues/6424#issuecomment-2467042441).
The problem was that when the prdoc file has two audiences, but only one
description like in
[prdoc_5660](https://github.com/paritytech/polkadot-sdk/blob/master/prdoc/1.16.0/pr_5660.prdoc)
it was ignored by the template.

Backport #6417 into `stable2407` from alindima.

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Co-authored-by: Alin Dima <alin@parity.io>

Backport #6148 into `stable2407` from bkontur.

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Co-authored-by: Branislav Kontur <bkontur@gmail.com>

Backport #6205 into `stable2407` from bkchr.

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---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: command-bot <>

Backport #5599 into `stable2407` from franciscoaguirre.

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Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>
Co-authored-by: command-bot <>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

Backport #4803 into `stable2407` from gotnoshoeson.

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Co-authored-by: Miles Patterson <miles_patterson@icloud.com>

Backport #5913 into `stable2407` from franciscoaguirre.

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Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>
Co-authored-by: Egor_P <egor@parity.io>

This PR backports fixes for the docker publishing flow from master:
- https://github.com/paritytech/polkadot-sdk/pull/5896
- https://github.com/paritytech/polkadot-sdk/pull/5387

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

Backport #3049 into `stable2407` from bgallois.

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Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Benjamin Gallois <gallois.benjamin08@gmail.com>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

Backport #5713 into `stable2407` from bkchr.

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Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

Backport #5594 into `stable2407` from Moliholy.

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Co-authored-by: José Molina Colmenero <jose@blockdeep.io>