new thing
it happened to me a couple of times (often while working on my sites) to see this screen.
lasts only a few seconds. The reason seems to be "entry processes".
Even these did not know ... I did a tour in google, they seem to be: An "Entry Process" is how many PHP scripts you have running at a single time.
I did not understand ...
What does it mean? Used by whom? What do you mean php script?
If you arrive 20 users at the same time the server crashes?
What is the same time? same second, the same minute, the same millisecond?
This is also a given server to which I never noticed, but perhaps if the sites grow, it could create problems.
In your server how many do you have? 20 am are few or many? How should it be?