Throughput cap that functions to protect the overall availability of the sequencer network. This algorithm provides a flexible and fair cap computation for all active sequencer clients (e.g., validators in the global synchronizer).

Requirements:

• Hard Cap: load on the network does not exceed the pre-configured maximum
• Modifiable: cap settings can be modified without a system restart (TODO(i28703))
• Fairness: under load, throughput is allocated fairly to each client
• Preference Settings: some clients may get higher throughput allocation via sequencer operator configuration (TODO(i28703))
• Elastic Demand Distribution: clients can exceed their fair share of throughput if the system provides sufficient capacity
• Quality of Service: clients may designate their transactions with a quality of service label to indicate the importance of each one (TODO(i28703))
• Message-type aware: caps are implemented with message type in mind to mainly target voluntary messages (e.g., confirmation and topology requests)

Non-requirements:

• No Resilience to Malicious Sequencers
• Approximation
• No Storage