I don't have access to the data on lemmy.ml. I have a small instance that appears on the joinlemmy site but not in the recommended section, so I can give you some data specific to a small instance.
Not sure if there is a direct way to pull this data, so I just made a little python script that queries the database and plots the number of users registered each day:
Code is under this spoiler tag in case someone wants to check this for their instance too:
spoiler
from subprocess import PIPE, Popen
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.dates import DateFormatter
command = 'docker exec POSTGRES_CONTAINER psql -U USER -c "select validator_time from local_user;"'
with Popen(command, stdout=PIPE, stderr=None, shell=True) as process:
output = process.communicate()[0].decode("utf-8")
time_signup = np.array(output.split('\n')[2:-3],dtype='datetime64[D]')
first_user = min(time_signup)
last_user = max(time_signup)
dates = np.arange(first_user,last_user+1)
count = [np.sum(time_signup == date) for date in dates]
fig, ax = plt.subplots()
plt.title('Amount of users registered per day to INSTANCE.TLD')
ax.plot(dates,count,c='k',lw=1)
myFmt = DateFormatter("%Y-%m-%d")
ax.xaxis.set_major_formatter(myFmt)
fig.autofmt_xdate()
plt.savefig('plot.png',dpi=300)
As to the number of requests per minutes... Hmm, I suppose that I can measure by counting the POST and GET requests in the nginx logs, I will try that and get back to you in a bit.