Okay, the problem is not gone in current 5.7 (5.7.2 from the official repo).
We restarted one affected system 2 days ago. Since then, I have dumped the shm
summary a few times.
Shortly after restart:
```
NOTICE: qm_sums: qm_sums(): count= 159 size= 42000 bytes from core:
core/dns_cache.c: dns_cache_mk_rd_entry(1117)
```
After running for 10 hours:
```
NOTICE: qm_sums: qm_sums(): count= 9822 size= 2857152 bytes from core:
core/dns_cache.c: dns_cache_mk_rd_entry(1117)
```
After running for 2 days:
```
NOTICE: qm_sums: qm_sums(): count= 39931 size= 12716680 bytes from core:
core/dns_cache.c: dns_cache_mk_rd_entry(1117)
```
Answering your question about the amount of different domains: We have a pretty
static load sharing over all proxies, so without an outage the same amount of
customer trunks always get routed through the same proxy. And there are only
10-20 carriers that actually get routed through those proxies. The only special
thing are Telekom CompanyFlex trunks, where every customer has their own dns
name, which gets set in `$du` when handling the packet. All other trunks get
routed simply via `$ru`.
In total there are just about 1k trunks registered through each system.
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