fix: remove TTI (alpha) from performance category

[patrickhulce]

This hides TTI from being displayed but still leaves it in the audits so it will appear in the trace if --save-assets and you run with the default or with onlyAudits: ['time-to-interactive']

[paulirish]

/home/travis/build/GoogleChrome/lighthouse/lighthouse-cli/test/smokehouse/smokehouse.js:174
throw new Error(Config did not trigger run of expected audit ${auditName});
^
Error: Config did not trigger run of expected audit time-to-interactive
at auditNames.map.auditName (/home/travis/build/GoogleChrome/lighthouse/lighthouse-cli/test/smokehouse/smokehouse.js:174:13)

[patrickhulce]

fixed

[denar90]

What about https://github.com/GoogleChrome/lighthouse/blob/master/lighthouse-core/lib/traces/pwmetrics-events.js#L134-L144?
Should it be also cleaned up?

[patrickhulce]

@denar90 we're not actually removing the logic or the audit until later (probably next week) this just hides it from the report and removes it from --perf, still getting the timestamp in the trace for a few more days is intentional :)

[denar90]

I'm asking because TTI is not present in audits object which is causing some errors for pwmetrics. I'm trying to integrate the latest master from c908e81 commit.

[patrickhulce]

@denar90 yeah that's probably because you're referencing the perf.json config, if you still want to surface the old TTI you'll have to explicitly include it in your config, otherwise you can ignore errors from missing events like we do

[denar90]

@patrickhulce thanks 👍