run-time configurable logging for inter-protocol

[dckc]

What is the Problem Being Solved?

To diagnose a problem with liquidation (#5513), turning on the existing tracers was very handy. Being able to turn them on without hacking the code would let us use these diagnostics in deployed networks.

Description of the Design

While our survey of logging frameworks (#1318) hasn't come to a firm conclusion, we do have precedent to use anylogger:

agoric-sdk/packages/SwingSet/src/controller/controller.js

Line 263 in 986ae7f

console: makeConsole(`${debugPrefix}SwingSet:kernel`),

https://github.com/Agoric/agoric-sdk/blob/master/docs/env.md#debug

Security Considerations

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Test Plan

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