Yes I had found those same articles but was hesitant to suggest it not being able to reproduce the issue 
But for me, issues still exist. Again, I am trying to add the servers to PMM, and again, I am facing the same issue. 
Hi @Naresh9999 can I ask 2 questions?
Have you migrated to service accounts? Is it possible that one of your old PMM Clients are still configured to old server or have incorrect API key and keeps trying to connect to PMM Server?
@nurlan I have never migrated to service accounts. This is a new server I have created from scratch.
Is there any way that I can identify which server is trying?
for What it is worth… I did a search for grafana.db inside the docker and found two of them… Not quite sure why or if somehow I did it…
But Once I did pragma journal_mode=wal on both files I have not seen it (yet) I did NOT think to look at the other potential settings prior to me setting this
Additionally I did find that when I work with the Alerting aspect quickly I tend to see it happen more often (modifying alerts after using a Template base that comes with pmm)
Inside the docker
find / -name grafana.db
cd to the directory. also research a few other tweaks you can do on the file I am running 80 nodes now with no issues
I found the below files.
bash-5.1# find / -name grafana.db
/etc/grafana/grafana.db
/opt/grafana.db
/srv/grafana/grafana.db
/usr/share/grafana/grafana.db
bash-5.1#
While I do NOT know if it is suggested I have not seen the issue since I did the following as well as the above (Again on each grafana.db file as I had two but was not sure WHY I had two)
Do this at your own risk…**** I only did the first three .
When you issue the commands you MUST be in the directory that the grafana.db file is in… Else it does nothing
sqlite> pragma journal_mode=wal;
sqlite> PRAGMA cache_size = 10000; -- Set cache size to 10000 pages
sqlite> PRAGMA synchronous = OFF; -- Disable synchronous write (less durable, more performance)
sqlite> PRAGMA locking_mode = EXCLUSIVE; -- Use exclusive locking mode
sqlite> PRAGMA busy_timeout = 1000; -- Set a timeout of 1 second for waiting on locks
sqlite> PRAGMA temp_store = MEMORY; -- Use memory for temporary storage (if feasible)
Also if you are like me and new to Docker Make sure you commit the changes as well (and then I normally restart the docker)
Many thanks for your assistance. I’ll test out the aforementioned suggestions and keep you informed of my results.
@meyerder New servers are being added to PMM, and so far, so good. I will update you complete status by tomorrow or day after tomorrow.
Only the parameters below have been altered by me:
sqlite> pragma journal_mode=wal;
@meyerder @steve.hoffman @nurlan @Roma_Novikov
The issue was fixed by switching the journal_mode from del to wal. As of now, PMM is functioning well.
Thanks for all your support.
SQLlite DB path: /srv/grafana/grafana.db
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Thanks for the update, @Naresh9999!
Everyone suffering from the issue - can use this workaround.
We are in the final stages of testing PG inside PMM, so this problem should disappear.
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It seems that two SQLite databases are running inside a container, so we are migrating both SQLite databases to PostgreSQL, right, Roma?
we’ll migrate SQLite used by Grafana. not sure is this one or several Db 
@Roma_Novikov Can you please check whether the below path or not?
SQLlite DB path: /srv/grafana/grafana.db