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#### Type Of Change - [ ] Small bug fix (non-breaking change which fixes an issue) - [x] New feature (non-breaking change which adds new functionality) - [ ] 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