could not open temporary statistics file

Hi

I am not quite sure whether I am at the right place here.

I installed PostgreSQL on a DebianEdu 11 system. First, I had only
version 14 by the "versionless" package. It ran as far as I can
remember (at least I remember creating roles and databases). Then I
decided to install 11 to 13 too to test "simultaneously" on several
versions. I did so on two systems and moved /etc/postgresql to a place
where I could put it into subversion and symlinked.

thiemo @ thiemos-toshi ~ % ll -d /etc/postg*
lrwxrwxrwx 1 root     root       62 Mai  4 01:32 /etc/postgresql ->
/home/thiemo/private_documents/linux/skolelinux/etc/postgresql

thiemo @ thiemos-toshi ~ % tree
/home/thiemo/private_documents/linux/skolelinux/etc/postgresql
/home/thiemo/private_documents/linux/skolelinux/etc/postgresql
├── 11
│   ├── main
│   │   ├── conf.d
│   │   ├── environment
│   │   ├── pg_ctl.conf
│   │   ├── pg_hba.conf
│   │   ├── pg_ident.conf
│   │   ├── postgresql.conf
│   │   └── start.conf
│   └── postgresql.conf -> main/postgresql.conf
├── 12
│   ├── main
│   │   ├── conf.d
│   │   ├── environment
│   │   ├── pg_ctl.conf
│   │   ├── pg_hba.conf
│   │   ├── pg_ident.conf
│   │   ├── postgresql.conf
│   │   └── start.conf
│   └── postgresql.conf -> main/postgresql.conf

I cannot remember having changed the structure of the structure of the
config directory, so I am puzzled to find the directory "main" within.
I think it is causing troubles because before I symlinked
postgresql.conf, trying to start ended in complaints of not finding
said config file. This, I will ask Debian people.

Now, it sort of starts, but it keeps logging missing statistics file
and using stale statistics.
postgres@thiemos-toshi:~$ /usr/lib/postgresql/11/bin/postgres -p 5431
-D /etc/postgresql/11/main/
2022-05-09 23:49:38.378 CEST [45056] LOG:  listening on IPv6 address
"::1", port 5431
2022-05-09 23:49:38.378 CEST [45056] LOG:  listening on IPv4 address
"127.0.0.1", port 5431
2022-05-09 23:49:38.379 CEST [45056] LOG:  listening on Unix socket
"/var/run/postgresql/.s.PGSQL.5431"
2022-05-09 23:49:38.398 CEST [45057] LOG:  database system was shut
down at 2022-05-09 18:50:09 CEST
2022-05-09 23:49:38.409 CEST [45056] LOG:  database system is ready to
accept connections
2022-05-09 23:49:38.413 CEST [45062] LOG:  could not open temporary
statistics file "/var/run/postgresql/11-main.pg_stat_tmp/global.tmp":
No such file or directory
...
2022-05-09 23:51:08.782 CEST [45061] LOG:  using stale statistics
instead of current ones because stats collector is not responding

I am concerned about three things.
- Performance problems because of the stale statistics being used
- Filling up log unnecessarily
- The linking of postgresql.conf will have side effects.

Actually, the first one is not that much of concern as I do not burden
load on the server, but I wonder what this is about. What do you think?

Kind regards

Thiemo

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