Description

This PR captures time taken in different functions using global tx pool lock. The primary one being add function responsible for adding new transactions to the pool.

As the stress tests on amoy resulted in lot of wait time for freeing the lock while calling txpool.Pending, it makes sense to capture some more details about things happening while holding the lock. Because the time increased as the number of transactions being added increased, it makes sense to capture some nuanced metrics while adding a transaction.

The solution isn't very neat as there are multiple code paths. The aim was to not do any behavioural changes which can be hard to review and test. Instead all metric collection related stuff is added to main function. Note that it can be removed or simplified once bottlenecks are identified.

Changes

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Changes only for a subset of nodes

Breaking changes

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Nodes audience

In case this PR includes changes that must be applied only to a subset of nodes, please specify how you handled it (e.g. by adding a flag with a default value...)

Checklist

• I have added at least 2 reviewer or the whole pos-v1 team
• I have added sufficient documentation in code
• I will be resolving comments - if any - by pushing each fix in a separate commit and linking the commit hash in the comment reply
• Created a task in Jira and informed the team for implementation in Erigon client (if applicable)
• Includes RPC methods changes, and the Notion documentation has been updated

Cross repository changes

• This PR requires changes to heimdall
  • In case link the PR here:
• This PR requires changes to matic-cli
  • In case link the PR here:

Testing

• I have added unit tests
• I have added tests to CI
• I have tested this code manually on local environment
• I have tested this code manually on remote devnet using express-cli
• I have tested this code manually on amoy
• I have created new e2e tests into express-cli

Manual tests

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Additional comments

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