Fix compatibility with Sanic 21.12.0+

[jmarcet]

The deprecation is now an error with current Sanic 21.12.0

Would you mind to include the fix?

[sorenrife]

LGTM

[anna-hope]

Is there any timeline for merging this?

[anttilip]

In __init__.py lines 134 and 144 app.memcollect_task should be changed to app.ctx.memcollect_task as these are still causing errors.

sanic-prometheus/sanic_prometheus/__init__.py

Lines 132 to 145 in 24c1586

	@app.listener('before_server_start')
	async def start_memcollect_task(app, loop):
	app.memcollect_task = loop.create_task(
	metrics.periodic_memcollect_task(
	app,
	mmc_period_sec,
	loop
	)
	)
	@app.listener('after_server_stop')
	async def stop_memcollect_task(app, loop):
	app.memcollect_task.cancel()

[ghost]

Are you still working on this? @jmarcet

[jmarcet]

@ghost I had forgotten completely about this PR. I've been using it all this time without that change 😅