feat: add sudo call to disable emissions for a subnet

[MkDev11]

Description

This PR implements a new sudo call sudo_set_emissions_disabled that allows root to disable or enable TAO emissions for a specific subnet. When emissions are disabled for a subnet, it will be filtered out from the list of subnets that receive emissions during the coinbase process.

Closes #2287

Implementation Details

Storage

• EmissionsDisabled: New storage map in subtensor pallet (MAP ( netuid ) --> bool)
  • Default value: false (emissions enabled)
  • Location: pallets/subtensor/src/lib.rs

Events

• EmissionsDisabledSet(NetUid, bool): Emitted when emissions are enabled/disabled for a subnet
  • Location: pallets/subtensor/src/macros/events.rs

Extrinsics

• sudo_set_emissions_disabled(origin, netuid, disabled): New sudo call in admin-utils pallet
  • Call index: 84
  • Access: Root only (ensure_root)
  • Validation: Checks subnet exists before modifying
  • Location: pallets/admin-utils/src/lib.rs

Core Logic Changes

• get_subnets_to_emit_to: Updated to filter out subnets where EmissionsDisabled is true

  • Location: pallets/subtensor/src/coinbase/subnet_emissions.rs

• remove_network: Added cleanup for EmissionsDisabled storage when subnet is dissolved

  • Location: pallets/subtensor/src/coinbase/root.rs

Utility Functions

• get_emissions_disabled(netuid): Getter for EmissionsDisabled storage
• set_emissions_disabled(netuid, disabled): Setter that also emits the event
  • Location: pallets/subtensor/src/utils/misc.rs

Related Issue(s)

• Closes Sudo call to disable emissions for a subnet #2287

Type of Change

• New feature (non-breaking change which adds functionality)

Breaking Change

This PR does not introduce a breaking change. The new storage item defaults to false (emissions enabled), so existing subnets will continue to receive emissions as before. The new functionality is opt-in via the sudo call.

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have run ./scripts/fix_rust.sh to ensure my code is formatted and linted correctly
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Testing

Unit Tests Added

1. test_sudo_set_emissions_disabled (pallets/admin-utils/src/tests/mod.rs)

   • Verifies default value is false
   • Verifies non-root cannot call the extrinsic (returns BadOrigin)
   • Verifies root can disable emissions
   • Verifies root can re-enable emissions

2. test_sudo_set_emissions_disabled_subnet_not_exist (pallets/admin-utils/src/tests/mod.rs)

   • Verifies error when subnet doesn't exist

3. test_get_subnets_to_emit_to_filters_emissions_disabled (pallets/subtensor/src/tests/coinbase.rs)

   • Verifies subnets with emissions disabled are filtered out
   • Verifies re-enabling emissions adds subnet back to emission list

Benchmarking

• Added benchmark for sudo_set_emissions_disabled in pallets/admin-utils/src/benchmarking.rs

Commands to Run Tests

# Run admin-utils tests
cargo test -p pallet-admin-utils test_sudo_set_emissions_disabled

# Run subtensor coinbase tests
cargo test -p pallet-subtensor test_get_subnets_to_emit_to_filters_emissions_disabled

# Run clippy
cargo clippy -p pallet-subtensor -p pallet-admin-utils -- -D warnings

# Check formatting
cargo fmt --check -p pallet-subtensor -p pallet-admin-utils

Screenshots (if applicable)

N/A - This is a backend/runtime change with no UI components.

Additional Notes

Files Modified

File	Changes
pallets/subtensor/src/lib.rs	Added EmissionsDisabled storage map
pallets/subtensor/src/macros/events.rs	Added EmissionsDisabledSet event
pallets/subtensor/src/utils/misc.rs	Added getter/setter functions
pallets/subtensor/src/coinbase/subnet_emissions.rs	Added filter for disabled subnets
pallets/subtensor/src/coinbase/root.rs	Added cleanup in remove_network
pallets/admin-utils/src/lib.rs	Added sudo_set_emissions_disabled extrinsic
pallets/admin-utils/src/benchmarking.rs	Added benchmark
pallets/subtensor/src/tests/coinbase.rs	Added emission filtering test
pallets/admin-utils/src/tests/mod.rs	Added sudo call tests

Usage Example

// Disable emissions for subnet 1
AdminUtils::sudo_set_emissions_disabled(
    RuntimeOrigin::root(),
    NetUid::from(1),
    true  // disabled = true
)?;

// Re-enable emissions for subnet 1
AdminUtils::sudo_set_emissions_disabled(
    RuntimeOrigin::root(),
    NetUid::from(1),
    false  // disabled = false
)?;

[MkDev11]

@open-junius Please check the update again and let me know the result.

[MkDev11]

The cargo audit CI failed due to a Rust version mismatch - smol_str@0.3.4 requires rustc 1.89 but the CI runner has 1.88.0. This is a CI infrastructure issue unrelated to my changes.

[open-junius]

The cargo audit CI failed due to a Rust version mismatch - smol_str@0.3.4 requires rustc 1.89 but the CI runner has 1.88.0. This is a CI infrastructure issue unrelated to my changes.
No worry, we have PR for it #2244.

[MkDev11]

@sam0x17 Can you please check the PR if you are available?

[open-junius]

@open-junius who is another reviewer?

will add team members to review it.

[MkDev11]

@gztensor @l0r1s Please review this PR and let me know your feedbacks when you are available.