Update Feature Support Matrix (Graph Node v0.31.0) Substreams Data Sources

Description

This is an update to the previously ratified Feature Support Matrix included in GGP-0026, GGP-0023, GGP-0022, and GGP-0018.

To ensure that Indexers will index substreams-powered subgraphs, the GIP proposes to add Oracle support for dataSource.kind =="substreams" to the Feature Matrix. This would make an important moment where the performance promises we have made come to fruition. With a very important indexing-time performance boost, as well as an important injection-time performance boost. Adding Substreams support to Graph Node is the fastest way to bring the performance and composability benefits of substreams to The Graph Network.

Next Steps

Merge the PR on the Indexer repo if and when the council vote is approved.

Updated Feature Support Matrix

This GIP proposes initial support for indexing rewards only on Ethereum mainnet (mainnet) substreams. However, it doesn't mean indexing rewards will be supported on a chain basis: mainnet is the starting point, based on early data determinism assurances and Indexer readiness to operate an Ethereum Firehose at scale, whose implementation has been battle-tested by core developers and the Indexer community during the MIPs program. More on data determinism can be found in Deterministic indexing.

The proposed updated Feature Matrix, including the new Substreams data sources subgraph feature, with indexing rewards support for mainnet substreams. More on Subgraph API versioning and feature support can be found in GIP-008.

graph-node: >=0.31 <0.32

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