FieldSpec returns a spec for a common batching field.

NewPolicy creates an empty policy with default rules.

NewPolicyConfig creates a default PolicyConfig.

SanitisePolicyConfig returns a policy config structure ready to be marshalled with irrelevant fields omitted.

Policy implements a batching policy by buffering messages until, based on a set of rules, the buffered messages are ready to be sent onwards as a batch.

PolicyConfig contains configuration parameters for a batch policy.