Remove ipstats, use graphite instead

[cdrini]

Related to #5144

• Remove ipstats file from here and any refs in olsystem
• Update homepage graph to hit http://graphite.us.archive.org/render/?min=0&template=plain&lineMode=staircase&areaMode=stacked&areaAlpha=0.5&yAxisSide=right&title=openlibrary+++Unique+IPs+per+day+++(uip_openlibrary)&hideLegend=true&target=cactiStyle(alias(summarize(sumSeries(group(stats.uniqueips.openlibrary)),%221day%22),%22openlibrary+++Unique+IPs+per+day+++(uip_openlibrary)%22))&colorList=00ff00&height=200&width=900&from=-60days&format=json , and coerce the data to be in this format:

[[1675987200000, 141032], [1676073600000, 136506], [1676160000000, 121618],...

• Remove /admin/ipstats endpoint

[cclauss]

admin_range__visitors() in openlibrary/admin/numbers.py needs to be rewritten to read the data from Graphite as discussed above.

[cdrini]

admin_range__visitors() appears to be dead code and can be entirely deleted.

Only this function will need to be updated:

openlibrary/openlibrary/core/admin.py

Lines 104 to 117 in 2a36c54

	@cache.memoize(engine="memcache", key="admin._get_count_docs", expires=5 * 60)
	def _get_count_docs(ndays):
	"""Returns the count docs from admin stats database.
	This function is memoized to avoid accessing the db for every request.
	"""
	today = datetime.datetime.utcnow().date()
	dates = [today - datetime.timedelta(days=i) for i in range(ndays)]
	# we want the dates in reverse order
	dates = dates[::-1]
	docs = [web.ctx.site.store.get(d.strftime("counts-%Y-%m-%d")) for d in dates]
	return [d for d in docs if d]

To add a visitors field to each item from the graphite url listed above.

[cclauss]

% docker logs openlibrary_cron-jobs_1 --follow

2023-04-01 20:16:26 [4096] [openlibrary.admin.stats] [WARNING]   admin_range__visitors - No statistics available
2023-04-01 20:16:26 [4096] [openlibrary.admin.stats] [INFO]   admin_range__works - 842
2023-04-01 20:16:26 [4096] [openlibrary.admin.stats] [INFO] Removing sqlite file used for ipstats
2023-04-01 20:17:24 [openlibrary.dump] split_dump 27,000,000

[mekarpeles]

#3827 #3838 #7602 #7622

Broken on production (old code)
Working on staging, but off by a factor of 10? 100?

[cdrini]

Put that bug in its own issue here: #7936