I'd like a way to not log as error stuff that isn't an actual error

[Yoric]

For instance, in the CI logs of Mjölnir, we have dozens of

Thu, 13 Jan 2022 10:45:32 GMT [ERROR] [MatrixHttpClient (REQ-264)] Error: Error during MatrixClient request GET /_matrix/client/r0/rooms/!nyFIVcdXpHcpRNRBFk%3Alocalhost%3A9999/state/m.room.canonical_alias/: 404 Not Found -- {"errcode":"M_NOT_FOUND","error":"Event not found."}
    at /home/yoric/Documents/Code/mjolnir/src/utils.ts:231:21
    at result (/home/yoric/Documents/Code/mjolnir/src/utils.ts:338:21)
    at new Promise (<anonymous>)
    at /home/yoric/Documents/Code/mjolnir/src/utils.ts:337:43
    at Generator.next (<anonymous>)
    at /home/yoric/Documents/Code/mjolnir/src/utils.ts:23:71
    at new Promise (<anonymous>)
    at __awaiter (/home/yoric/Documents/Code/mjolnir/src/utils.ts:19:12)
    at /home/yoric/Documents/Code/mjolnir/src/utils.ts:333:39
    at /home/yoric/Documents/Code/mjolnir/node_modules/matrix-bot-sdk/lib/http.js:63:33
    at new Promise (<anonymous>)
    at Object.doHttpRequest (/home/yoric/Documents/Code/mjolnir/node_modules/matrix-bot-sdk/lib/http.js:62:12)
    at MatrixClient.doRequest (/home/yoric/Documents/Code/mjolnir/node_modules/matrix-bot-sdk/lib/MatrixClient.js:1493:23)
    at MatrixClient.descriptor.value (/home/yoric/Documents/Code/mjolnir/node_modules/matrix-bot-sdk/lib/metrics/decorators.js:22:41)
    at MatrixClient.getRoomStateEvent (/home/yoric/Documents/Code/mjolnir/node_modules/matrix-bot-sdk/lib/MatrixClient.js:737:21)
    at MatrixClient.descriptor.value (/home/yoric/Documents/Code/mjolnir/node_modules/matrix-bot-sdk/lib/metrics/decorators.js:22:41)
    at MatrixClient.<anonymous> (/home/yoric/Documents/Code/mjolnir/node_modules/matrix-bot-sdk/lib/MatrixClient.js:335:42)
    at Generator.next (<anonymous>)
    at fulfilled (/home/yoric/Documents/Code/mjolnir/node_modules/matrix-bot-sdk/lib/MatrixClient.js:14:58)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)

(we have a custom requestFn that cleans up error logs - otherwise, it's 800loc and no stack)

All of them caused by innocuous calls to getPublishedAlias.