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Metrics are collected and merged in http.prometheus, no need to be run
on every worker.

Instead of throwing an error in the HTTP handler, server should log it.
This covers errors like client disconnecting before reading the response
body etc.

This was previously hardcoded to 16. This makes it at least a compile time
define, with a default of 511 (as that's what Redis and Apache use).

Minor changes to be blamed on Vladimir.

Minor changes to be blamed on Vladimir.

... done in the few preceding commits.
I intentionally don't mention ::daemon_context at this point.

We were quite inconsistent here.

- answer_finalize: new layer
- kr_request: keep ::qsource.packet beyond the begin phase
- kr_request: add ::daemon_context

release 3.1.0

See merge request !692

lib/zonecut: avoid one kind of NS dependency cycles

Closes #374

See merge request !690

The problem here was that we need to know which addresses are timed-out
(and not to be re-probed) much earlier than we do NS selection ATM -
that's because under some circumstances it affects the depth of NS
zone cut that we choose, i.e. if all addresses in a certain zone cut are
"bad" in a certain sense, we need to use a zone cut closer to the root,
because otherwise we'd get into a dependency cycle.

packaging: updates

See merge request !676

lib/generic/queue: remove a ssize_t cast

See merge request !691

The Alpine-based Docker image wouldn't compile.
I can't see a reason for the cast now - it's a sum of compile-time
constants, and very unlikely to overflow on changes in code or platform.

cache.clear('name') edge cases

Closes #401

See merge request !670

Thanks to Marek for noticing it.

It fired also when the name didn't contain the final dot.

We use it as relatively high-level function, often on user-input names,
so it seems suitable that it does convert the case.
This fixes cache.clear('Example.Org.'), and probably also negative trust
anchors and policy uses.

docs for daemon: better visibility for control sockets

See merge request !682

- promote the part into a section
- move it right after the section about interactive CLI
- minor reformulations, location of the sockets, etc.
- fix location of the daemon-supervised anchor