chore: bump egress tracking to 50%

[fforbeck]

Ramp-Up Schedule

1% → 5% → 10% → 25% → 50% → 100%

Phase	%	Events/s (avg)	Events/s (peak)	Queue %	Start Date	Duration
Start	1%	11.5	30	0.6%	Nov 20	1 days	✅
Data Collection	5%	57	150	3%	Nov 22	1 days	✅
Analysis	10%	115	300	6%	Nov 24	1 days	✅
Ramp	25%	287	750	15%	Nov 26	1 days	✅
Major	50%	573	1,500	30%	Nov 28	2 days	🔧
Full	100%	1,146	3,000	60%	Nov 30	Ongoing