@pnp/sp/behaviors/telemetry.js

export function Telemetry() {
    return (instance) => {
        instance.on.pre(async function (url, init, result) {
            let clientTag = "PnPCoreJS:3.4.1:";
            // make our best guess based on url to the method called
            const { pathname } = new URL(url);
            // remove anything before the _api as that is potentially PII and we don't care, just want to get the called path to the REST API
            clientTag += pathname.substring(pathname.indexOf("_api/") + 5).split("/").map((value, index, arr) => index === arr.length - 1 ? value : value[0]).join(".");
            if (clientTag.length > 32) {
                clientTag = clientTag.substring(0, 32);
            }
            this.log(`Request Tag: ${clientTag}`, 0);
            init.headers = { ...init.headers, ["X-ClientService-ClientTag"]: clientTag };
            return [url, init, result];
        });
        return instance;
    };
}
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