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#### Type Of Change
- [ ] Small bug fix (non-breaking change which fixes an issue)
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- [ ] Breaking change (fix or feature that would change existing functionality)
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#### Description
I remember there was some discussion about adding DNS statistics, I think I remember a
discussion involving @ngvoice Carsten ?
This is adding a parameter to the core `dns_slow_query_ms`
Example:
```
dns_slow_query_ms=100
```
When using the internal resolver any query taking more than `dns_slow_query_ms` will be
lodged as a warning :
```
dns_slow_query_ms=10 (example with 10ms)
5(5960) WARNING: <core> [core/resolve.c:752]: get_record():
res_search[35][us-west-wa.sip.flowroute.com]elapsed[12ms]
5(5960) WARNING: <core> [core/resolve.c:752]: get_record():
res_search[1][ep-us-west-wa-01.flowroute.com]elapsed[12ms]
```
and a statistic counter will be incremented :
```
kamcmd stats.fetch dns:slow_dns_request
{
dns.slow_dns_request: 1
}
```
I think this will be a good start to monitor the impact of slow DNS queries on Kamailio.
You can view, comment on, or merge this pull request online at:
https://github.com/kamailio/kamailio/pull/1824
-- Commit Summary --
* core: dns slow queries reporting
-- File Changes --
M src/core/cfg.lex (3)
M src/core/cfg.y (3)
M src/core/cfg_core.c (3)
M src/core/cfg_core.h (1)
M src/core/resolve.c (17)
M src/core/resolve.h (3)
-- Patch Links --
https://github.com/kamailio/kamailio/pull/1824.patch
https://github.com/kamailio/kamailio/pull/1824.diff
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