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Reactive syncing metrics (#5410)
Nazar Mokrynskyi authored 
This PR untangles syncing metrics and makes them reactive, the way
metrics are supposed to be in general.

Syncing metrics were bundled in a way that caused coupling across
multiple layers: justifications metrics were defined and managed by
`ChainSync`, but only updated periodically on tick in `SyncingEngine`,
while actual values were queried from `ExtraRequests`. This convoluted
architecture was hard to follow when I was looking into
https://github.com/paritytech/polkadot-sdk/issues/5333.

Now metrics that correspond to each component are owned by that
component and updated as changes are made instead of on tick every
1100ms.

This does add some annoying boilerplate that is a bit harder to
maintain, but it separates metrics more nicely and if someone queries
them more frequently will give arbitrary resolution. Since metrics
updates are just atomic operations I do not expect any performance
impact of these changes.

Will add prdoc if changes look good otherwise.

P.S. I noticed that importing requests (and corresponding metrics) were
not cleared ever since corresponding code was introduced in
https://github.com/paritytech/polkadot-sdk/commit/dc41558b#r145518721
and I left it as is to not change the behavior, but it might be
something worth fixing.

cc @dmitry-markin



---------

Co-authored-by: default avatarDmitry Markin <dmitry@markin.tech>
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substrate
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umbrella
.gitignore
.gitlab-ci.yml
.prdoc.toml
.rustfmt.toml
Cargo.lock
Cargo.toml
README.md
README.md

SDK Logo SDK Logo

Polkadot SDK

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The Polkadot SDK repository provides all the components needed to start building on the Polkadot network, a multi-chain blockchain platform that enables different blockchains to interoperate and share information in a secure and scalable way.

⚡ Quickstart

If you want to get an example node running quickly you can execute the following getting started script:

curl --proto '=https' --tlsv1.2 -sSf https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/scripts/getting-started.sh | bash

📚 Documentation

🚀 Releases

[!NOTE] Our release process is still Work-In-Progress and may not yet reflect the aspired outline here.

The Polkadot-SDK has two release channels: stable and nightly. Production software is advised to only use stable. nightly is meant for tinkerers to try out the latest features. The detailed release process is described in RELEASE.md.

You can use psvm to manage your Polkadot-SDK dependency versions in downstream projects.

😌 Stable

stable releases have a support duration of three months. In this period, the release will not have any breaking changes. It will receive bug fixes, security fixes, performance fixes and new non-breaking features on a two week cadence.

🤠 Nightly

nightly releases are released every night from the master branch, potentially with breaking changes. They have pre-release version numbers in the format major.0.0-nightlyYYMMDD.

🛠️ Tooling

Polkadot SDK Version Manager: A simple tool to manage and update the Polkadot SDK dependencies in any Cargo.toml file. It will automatically update the Polkadot SDK dependencies to their correct crates.io version.

🔐 Security

The security policy and procedures can be found in docs/contributor/SECURITY.md.

🤍 Contributing & Code of Conduct

Ensure you follow our contribution guidelines. In every interaction and contribution, this project adheres to the Contributor Covenant Code of Conduct.

👾 Ready to Contribute?

Take a look at the issues labeled with mentor (or alternatively this page, created by one of the maintainers) label to get started! We always recognize valuable contributions by proposing an on-chain tip to the Polkadot network as a token of our appreciation.

Polkadot Fellowship

Development in this repo usually goes hand in hand with the fellowship organization. In short, this repository provides all the SDK pieces needed to build both Polkadot and its parachains. But, the actual Polkadot runtime lives in the fellowship/runtimes repository. Read more about the fellowship, this separation, the RFC process here.

History

This repository is the amalgamation of 3 separate repositories that used to make up Polkadot SDK, namely Substrate, Polkadot and Cumulus. Read more about the merge and its history here.