I have a few EB instances running with the default settings, but even though they're barely doing anything at the moment (literally just running static holding pages with no visitors), they keep falling into moments of Severe health problems.
Why is this? Should I be concerned? Again, they're configured using the default EB settings.
UPDATE
Here's the access logs. They support the @bazze's supposition that EB healthcheck is looking at several common uRLs as a test, and gets 404 as reply:
[26/Nov/2017:17:09:46 +0000] "GET / HTTP/1.1" 200 2422 "-" "ELB-HealthChecker/1.0"
[26/Nov/2017:17:09:46 +0000] "HEAD /sql/sql-admin/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:47 +0000] "HEAD /sql/phpmyadmin2/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:47 +0000] "HEAD /sql/phpMyAdmin2/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:47 +0000] "HEAD /sql/phpMyAdmin/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:47 +0000] "HEAD /db/myadmin/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:48 +0000] "HEAD /db/webadmin/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:48 +0000] "HEAD /db/dbweb/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:48 +0000] "HEAD /db/websql/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:48 +0000] "HEAD /db/webdb/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:49 +0000] "HEAD /db/dbadmin/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:49 +0000] "GET / HTTP/1.1" 200 2422 "-" "ELB-HealthChecker/1.0"
[26/Nov/2017:17:09:49 +0000] "HEAD /db/db-admin/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:49 +0000] "HEAD /db/phpmyadmin3/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:49 +0000] "HEAD /db/phpMyAdmin3/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:50 +0000] "HEAD /db/phpMyAdmin-3/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:50 +0000] "HEAD /administrator/phpmyadmin/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:50 +0000] "HEAD /administrator/phpMyAdmin/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:51 +0000] "HEAD /administrator/db/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:51 +0000] "HEAD /administrator/web/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:51 +0000] "HEAD /administrator/pma/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:51 +0000] "HEAD /administrator/PMA/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:52 +0000] "HEAD /administrator/admin/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:52 +0000] "HEAD /phpMyAdmin2/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:52 +0000] "HEAD /phpMyAdmin3/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:52 +0000] "HEAD /phpMyAdmin4/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:53 +0000] "HEAD /phpMyAdmin-3/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"
[26/Nov/2017:17:09:53 +0000] "HEAD /php-my-admin/ HTTP/1.1" 404 - "-" "Mozilla/5.0 Jorgee"