chore: fix Windows build, cpp-httplib 0.47 + dep bumps, spec gap fixes, move k8s example

[leoparente]

Summary

Housekeeping after the netprobe/ICMPv6/host_spec work: fix the Windows build, unblock the cpp-httplib upgrade that has been pinned since #784, refresh the other deps that have newer releases, close the small gaps left by the merged design specs, and move the Kubernetes sidecar example next to the other collection examples.

Dependencies (conanfile.py)

Package	From	To	Note
cpp-httplib	0.27.0	0.47.0	Recipe now exposes use_non_blocking_getaddrinfo; set to False so no libanl is linked (that was what broke the static musl cross builds on >= 0.28).
libcurl	8.21.0	8.22.0
openssl	3.6.3	3.6.4
catch2	3.15.1	3.16.0

Deliberately not bumped:

• openssl 4.0.x — every OpenSSL consumer on ConanCenter (libcurl incl. 8.22.0, libnghttp2, sentry-crashpad, cpp-httplib) still pins openssl/[<4]. It only resolves with force=True against the recipes' declared support. As a data point, libcurl 8.21.0 and opentelemetry-cpp 1.26.0 do compile against 4.0.2 on macOS, but Linux/musl (sentry-crashpad, nghttp2) is unverified. Revisit when libcurl widens its range.
• protobuf 7.35.0 — excluded by opentelemetry-cpp 1.26.0's protobuf/[<7].

Spec gap fixes

• ICMPv6 (feat(netprobe): IPv6 (ICMPv6) ping support (#624) #785): add the two CI-deterministic test cases from the design spec that were never written — literal ::1 target auto-detected and routed to a probe, and a DNS target with ip_version: 6 round-tripping through start() and info_json. They run through the tcp test type since a ping stream opens raw sockets and cannot start unprivileged in CI; the parse/route path under test is shared.
• pcap host_spec (fix(pcap): don't widen explicit host_spec with the interface subnet (Refs #758) #790): the top-level README's -H usage text (both pktvisord and pktvisor-reader blocks) still said live-capture host_spec "will append to any automatic detection". Synced with the CLI help: it now replaces auto-detection.
• netprobe HTTP v3 (feat(netprobe): HTTP probe v3 — response assertions (json/body/size/header/version) + per-target resolve/ip_version #794): content_failures in the handler README described only the v2 expected_body(_regex) checks; it now lists every v3 assertion (body, JSON, size, header, version).

Windows build fix

build-win64 has been red on develop since the #796 merge, but the cause is not that PR: it was simply the first build after ConanCenter published opentelemetry-cpp/1.26.0 recipe revision a671ccb (2026-08-18). That revision forces OTELCPP_PROTO_LIB_TYPE=STATIC_LIBRARY and disables upstream's shared/static selection, so opentelemetry_proto.lib is now static on Windows. Our root CMakeLists.txt still defined the non-propagated OPENTELEMETRY_PROTO_API macro as __declspec(dllimport) on Windows (a #784 workaround for the old revision that built the proto library as a DLL), so every opentelemetry::proto symbol became an unresolved __imp_ import (1500+ LNK2019/LNK2001). The macro is now defined empty on every platform, matching what upstream's project_build_tools_set_static_library_declaration does for MSVC. Last green Windows build (07-22) used revision 9d81768.

Windows CI time

The Windows Conan cache was evicted while the job was red (actions/cache only saves on success), so every run since 08-26 rebuilt all 34 dependencies from source. On top of that, Visual Studio is a multi-config generator and the cmake-conan provider defaults to installing both Release and Debug, so each cold configure built everything twice (over an hour). The Windows configure steps in build-develop.yml and build-release.yml now pass -DCONAN_INSTALL_BUILD_CONFIGURATIONS=$BUILD_TYPE; the jobs only ever build --config Release.

k8s example

k8s/ → centralized_collection/k8s/ (git rename). Apply command and dashboard relative path updated; linked from centralized_collection/README.md and the top-level README (it was unreferenced before).

Testing

Full Release build on macOS (arm64) with the bumped deps; ctest — 25/25 pass (all unit suites incl. unit-tests-visor-http-client, unit-tests-visor-http-check, unit-tests-input-netprobe with the two new [ipv6] cases, and the integration pcap tests). The static musl cross-build job on this PR is the real check for the cpp-httplib change.

🤖 Generated with Claude Code

[nbl-ai-review]

AI Code Review — risk tier: Lite · dimensions run: correctness, security

Advisory only. A human owns the merge decision.

Summary — Doc reorg, a k8s example rename, dependency version bumps in conanfile.py, and additive unit tests; no security-sensitive surface touched. No issues found — net positive.

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[github-actions]

LCOV of commit 5648a4a during Debug Builds #239

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