feat(core-node): Add allocation metrics to flamegraphs

[semenov-vladyslav]

Description of change

This PR adds global allocator wrapper counting allocation metrics (alloc, dealloc, peak) per thread. It uses unstable feature thread_local (it's the only reasonable way, thread_local! macro can't be used) which is guarded behind feature "flamegraph-alloc". The allocation stats are shown in rendered SVG.

Links to any relevant issues

Part of #8694.

How the change has been tested

• Basic tests (linting, compilation, formatting, unit/integration tests)
• Patch-specific tests (correctness, functionality coverage)
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

Release Notes

• Protocol:
• Nodes (Validators and Full nodes): Extend telemetry subscribers with allocations per thread metrics.
• Indexer:
• JSON-RPC:
• GraphQL:
• CLI:
• Rust SDK:
• REST API:

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6 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
apps-backend	Ignored	Preview		Dec 12, 2025 0:11am
apps-ui-kit	Ignored	Preview		Dec 12, 2025 0:11am
iota-evm-bridge	Ignored	Preview		Dec 12, 2025 0:11am
iota-multisig-toolkit	Ignored	Preview		Dec 12, 2025 0:11am
rebased-explorer	Ignored	Preview		Dec 12, 2025 0:11am
wallet-dashboard	Ignored	Preview		Dec 12, 2025 0:11am

[Copilot]

Pull request overview

This PR adds allocation tracking to flamegraphs by implementing a global allocator wrapper that counts allocation metrics (alloc, dealloc, peak) per thread. The feature uses the unstable thread_local attribute and is guarded behind the "flamegraph-alloc" feature flag.

Key Changes

• Implements a CounterAlloc wrapper around the global allocator to track per-thread allocation metrics
• Refactors the SVG rendering code to support multiple measurement types (time or memory allocations)
• Integrates allocation tracking into the admin API with a new mem query parameter
• Adds support for custom Rust toolchains and cargo features in the AWS orchestrator

Reviewed changes

Copilot reviewed 18 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
crates/telemetry-subscribers/src/lib.rs	Adds feature gate for unstable thread_local feature
crates/telemetry-subscribers/src/flamegraph/alloc.rs	Implements allocator wrapper and per-thread metrics tracking
crates/telemetry-subscribers/src/flamegraph/metric.rs	Integrates allocation metrics into FlameMetric
crates/telemetry-subscribers/src/flamegraph/svg.rs	Refactors rendering to support multiple measure types (time/memory)
crates/telemetry-subscribers/src/flamegraph/callgraph.rs	Adds Default derive to Frame
crates/telemetry-subscribers/src/flamegraph.rs	Exports allocation types when feature is enabled
crates/telemetry-subscribers/Cargo.toml	Defines flamegraph-alloc feature
crates/iota-node/src/main.rs	Sets up global allocator when feature is enabled
crates/iota-node/src/admin.rs	Adds mem parameter to flamegraph API
crates/iota-node/Cargo.toml	Propagates feature flag to telemetry-subscribers
crates/iota-benchmark/src/bin/flamegraph.rs	Demonstrates usage of allocation tracking in benchmark
crates/iota-benchmark/Cargo.toml	Adds feature and required-features for flamegraph binary
crates/iota/src/iota_commands.rs	Adds CLI flag for default admin interface address
crates/iota-swarm-config/src/node_config_builder.rs	Supports configurable admin interface address
crates/iota-swarm-config/src/network_config_builder.rs	Supports default admin interface address in builder
crates/iota-aws-orchestrator/src/settings.rs	Adds rust_toolchain and node_features settings
crates/iota-aws-orchestrator/src/protocol/mod.rs	Adds nodes_flamegraph_command method
crates/iota-aws-orchestrator/src/protocol/iota.rs	Implements custom cargo commands with features
crates/iota-aws-orchestrator/src/orchestrator.rs	Fetches flamegraphs separately for time and memory metrics

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