7880483b51
mara on the tracking issue: "we need the swarm label for upstream otel at least (the out of swarm one)." Stamped in the per-hive `resource` processor rather than on a separate upstream-only pipeline, which would double the pipeline count to withhold one constant label from the local store. It is redundant there — one metrics store per swarm, so every series in it already belongs to this swarm — but a constant label multiplies no series, and it means what leaves and what stays have the same shape. Upstream is where it stops being redundant: that is the one hop where several swarms can land in one store, and samples that cannot name their swarm collide there exactly as hives collided here before per-hive receivers existed. `unknown` when unnamed rather than an absent label, copying the agent path so a query never has to handle both "the label is missing" and "the label says unknown".
534 lines
25 KiB
Nix
534 lines
25 KiB
Nix
# The swarm's telemetry collector: one per swarm, in a `swarm-otel`
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# nixos-container beside the swarm's other shared services.
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#
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# Two tiers, and they are separate on purpose:
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#
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# - `otel.nix` is the **hive** tier. It receives from this hive's agents
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# on the bridge and forwards, and it holds no upstream credential.
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# - this is the **swarm** tier. It is the only holder of the upstream
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# credential, the only writer to the swarm's metrics store, and the
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# place that will stamp `hive=` from the authenticated connection
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# rather than from anything a sender can choose.
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#
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# On a host that runs both, both processes run. They are not collapsed:
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# all-local is a statement about *where* processes run, not about what
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# shape the deployment has, and a local tier boundary that disappears is
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# one the local deployment stops testing. `hive=` attribution is the
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# property that would differ, and the ingest auth that makes it
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# unforgeable is built on this boundary existing.
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#
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# A container rather than a second host unit, for the same reason every
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# sibling swarm service is one — and because `services.opentelemetry-collector`
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# is a singleton NixOS option, already spoken for on the host by the hive
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# tier. A container gets its own evaluation and therefore its own collector.
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{
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pkgs,
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lib,
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config,
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...
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}:
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let
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cfg = config.services.hyperhive.swarm.otel;
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swarmCfg = config.services.hyperhive.swarm;
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otelCfg = config.services.hyperhive.otel;
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vmCfg = config.services.hyperhive.swarm.victoriametrics;
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hyperhiveCfg = config.services.hyperhive;
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gatewayCfg = hyperhiveCfg.gateway;
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swarmDomain = hyperhiveCfg.swarm.domain;
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# Total on a null swarm domain for the same reason every sibling module is:
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# the required-domain assertion in hive-network.nix should be what an
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# operator sees, not a coercion error from here.
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domainBase = if swarmDomain == null then "invalid" else swarmDomain;
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autheliaCfg = hyperhiveCfg.swarm.authelia;
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# `attrNames` is sorted, so this is a function of the hive SET and not of
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# the order anyone wrote it in.
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#
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# These ports are internal and appear in no URL: a hive addresses its own
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# receiver as a PATH on this collector's single gateway name, and nginx —
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# rendered from this same evaluation — is the only thing that ever names
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# the port. That is what makes deriving them safe here and unsafe in the
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# obvious other place: were a hive told a port, inserting a hive would
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# renumber the ones after it and silently move a port a running hive was
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# already sending to.
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hivePorts = lib.listToAttrs (
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lib.imap0 (i: h: lib.nameValuePair h (cfg.port + i)) (lib.attrNames hyperhiveCfg.swarm.hives)
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);
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# The swarm's authelia is reached by its gateway name, whose leaf is
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# issued by the swarm services sub-CA — so this container needs the same
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# runtime CA trust every other consumer of a swarm-service name needs.
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# The CA is generated at runtime and cannot be baked into a derivation,
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# which is why it arrives as a bind mount rather than
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# `security.pki.certificateFiles`.
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caTrust = import ./lib/hive-ca-trust.nix {
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inherit lib;
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tlsCfg = hyperhiveCfg.tls;
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inherit gatewayCfg;
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};
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caBundle = caTrust.bundlePathFor cfg.machine;
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# `unknown` rather than omitting the label, copying `agent-modules/otel.nix`
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# deliberately: a producer that cannot name its swarm should say so in the
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# same vocabulary as every other producer, so a query never has to handle
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# both "the label is absent" and "the label says unknown".
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swarmDisplayName = if hyperhiveCfg.swarm.name == null then "unknown" else hyperhiveCfg.swarm.name;
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# One list, read by every pipeline: the per-hive pipelines fan out to
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# exactly the same destinations as the single pipeline they replace.
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# Written once because "which exporters" is a property of this tier, not
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# of which hive a sample came from.
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exporterNames =
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lib.optional (otelCfg.endpoint != "") (if otelCfg.protocol == "grpc" then "otlp" else "otlphttp")
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++ lib.optional vmCfg.enable "otlphttp/victoriametrics";
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in
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{
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options.services.hyperhive.swarm.otel = {
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enable = lib.mkOption {
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type = lib.types.bool;
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default = false;
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description = ''
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Run the swarm's telemetry collector on this host.
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Asserted from `swarm.enableRequiredServices` in
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./swarm-required-services.nix, with the metrics pair this
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collector feeds: a swarm has one of these, and it belongs
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wherever the shared services live rather than on every hive.
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A hive that does not run it still runs its own hive-tier collector
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(`services.hyperhive.otel.enable`) and reaches this one by name, at
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{option}`services.hyperhive.swarm.otel.domain`.
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'';
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};
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machine = lib.mkOption {
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type = lib.types.str;
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readOnly = true;
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default = "swarm-otel";
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description = ''
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Name of the nixos-container this collector runs in — also the
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`machinectl` name, so other modules may read it rather than
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repeating the literal.
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'';
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};
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port = lib.mkOption {
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type = lib.types.port;
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default = 4319;
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description = ''
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First port of this collector's receiver range. Every hive in
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{option}`services.hyperhive.swarm.hives` gets its **own**
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authenticated receiver — that is what makes the `hive` label
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unforgeable — so the range is one port per hive, starting here, in
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sorted-name order.
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⚠️ Internal. No client is ever told a port: a hive reaches its own
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receiver as `https://''${domain}/<hive>`, and the gateway routes on
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that path. So adding a hive, which renumbers the ones after it, is
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harmless — nginx is rendered from this same evaluation and moves
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with it.
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⚠️ **Deliberately not 4318**, the OTLP/HTTP default, because the
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hive tier already uses it (`services.hyperhive.otel.collector.port`)
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and every swarm container shares the host's network namespace. Two
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listeners claiming one port on one host is not a build failure —
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it is a runtime coin toss over which one gets it, with nothing in
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any log saying so. The same collision cost a release when grafana
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and the forge both defaulted to 3000. The assertions below check
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the whole derived range against every port this module and the hive
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tier declare, which is as far as a module can see.
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'';
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};
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telemetryPort = lib.mkOption {
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type = lib.types.port;
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default = 8889;
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description = ''
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Port this collector serves its **own** metrics on — queue depth,
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refused and dropped samples, exporter failures. How you find out
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that telemetry is being lost, so it is worth keeping rather than
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switching off.
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⚠️ **Deliberately not 8889's neighbour 8888**, which is the
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collector's built-in default and therefore what the hive tier
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already binds. Two collectors share a network namespace whenever
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they are co-located, and unlike the OTLP port this one appears
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nowhere in either config — it is a default inside the binary, so
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nothing that compares configured ports can see the clash. The
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second collector to start simply dies with
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`bind: address already in use`.
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'';
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};
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domain = lib.mkOption {
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type = lib.types.str;
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default = "otel.${domainBase}";
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defaultText = lib.literalExpression ''"otel.''${services.hyperhive.swarm.domain}"'';
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description = ''
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Name the gateway serves this on. A sibling of the swarm's other
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service names, so the swarm-services sub-CA can issue for it — see
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`hive-tls.nix` for why a service name being a sibling rather than a
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child decides which CA may sign it.
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This is what the **hive** tier's exporter reaches — the hive
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collector is a plain producer against this name exactly like every
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other client of a swarm service, resolved locally by dnsmasq on a
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co-located host and over the real network otherwise. There is no
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separate loopback-vs-remote knob to get wrong: `swarm-nats` is the
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deliberate exception to this pattern (its cross-hive reach is the
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wireguard mesh, not the gateway), everything else in this swarm
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addresses its siblings by name.
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'';
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};
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};
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config = lib.mkIf (config.services.hyperhive.enable && cfg.enable) {
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# The gateway name, inside `cfg.enable` — that guard is the load-bearing
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# part. Every hive in a swarm may know this collector exists, but only
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# the host that RUNS it may claim the name; a client hive declaring the
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# vhost would answer for a service it does not have.
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services.hyperhive.gateway.localNames = [ cfg.domain ];
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# OTLP/HTTP, not a browsable UI, but the same reverse-proxy shape as
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# every sibling swarm service: TLS terminates here, then plain http to
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# the co-located container over loopback (shared netns, like the store
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# this collector writes to).
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services.nginx.virtualHosts."${cfg.domain}" = (gatewayCfg.lib.tlsFor cfg.domain) // {
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listen = gatewayCfg.lib.listen;
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extraConfig = gatewayCfg.lib.securityHeaders;
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locations =
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# One name for the whole collector, and the hive is a path under
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# it. The alternative — a vhost per hive — needs a certificate,
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# a DNS name and a `localNames` entry per hive to express the
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# same routing the gateway already does for free.
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#
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# ⚠️ The trailing slash on both sides is load-bearing: it is what
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# strips `/<hive>` before the request reaches the receiver, which
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# serves `/v1/metrics` and knows nothing about hives. Without it
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# the receiver sees `/<hive>/v1/metrics` and answers 404 to a
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# request that authenticated perfectly.
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lib.mapAttrs' (
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h: p: lib.nameValuePair "/${h}/" { proxyPass = "http://127.0.0.1:${toString p}/"; }
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) hivePorts
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// {
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# There is no swarm-wide inbox, and a closed door is the honest
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# description of that. Every route into this collector belongs to
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# exactly one hive.
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"/".return = "404";
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};
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};
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# Turning on the identities this tier authenticates against, which the
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# option exists to allow: its own description names this module as the
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# second consumer, so the queue is not a prerequisite for authenticated
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# telemetry.
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services.hyperhive.swarm.authelia.oidc.hiveIdentities = true;
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# The CA bind source is written at runtime by a host unit, so the
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# container has to start after it — otherwise nspawn sets up a mount
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# over a file that does not exist yet.
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systemd.services."container@${cfg.machine}" = caTrust.containerOrdering;
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assertions = [
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{
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# The tier exists to hold the upstream credential and to write the
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# swarm's store. With neither, it is a process that receives
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# samples and drops them — which looks healthy and loses data.
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assertion = otelCfg.endpoint != "" || vmCfg.enable;
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message = ''
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services.hyperhive.swarm.otel.enable is true but this collector
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has nowhere to send what it receives:
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services.hyperhive.otel.endpoint is empty and
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services.hyperhive.swarm.victoriametrics.enable is false.
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Set the endpoint to export upstream, or enable the swarm's
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metrics store.
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'';
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}
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{
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# Without a roster there are no receivers at all, so this
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# collector would listen on nothing while looking configured.
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assertion = hyperhiveCfg.swarm.hives != { };
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message = ''
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services.hyperhive.swarm.otel.enable is true but
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services.hyperhive.swarm.hives is empty: ingest is authenticated
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per hive, so an empty roster means this collector accepts nothing
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from anyone.
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List the swarm's hives.
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'';
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}
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{
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# A hive proves who it is with a token this provider mints, so
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# there is no version of this collector that runs without one.
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# Stated as an assertion rather than a fallback because a guessed
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# issuer URL evaluates cleanly and refuses every hive at runtime.
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assertion = autheliaCfg.url != null;
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message = ''
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services.hyperhive.swarm.otel.enable is true but
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services.hyperhive.swarm.authelia.url is null: every hive
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authenticates to this collector as itself, and the token comes
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from the swarm's identity provider.
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Point authelia.url at the swarm's provider, or enable
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services.hyperhive.swarm.authelia on the host that runs it.
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'';
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}
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{
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# A port collision between two listeners on one host is a runtime
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# coin toss with nothing in any log — the failure this whole
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# comment budget exists to prevent. Checked against every port
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# reachable from here; a port some other module picks is not.
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#
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# ⚠️ `cfg.port` is deliberately absent from `others`: it is the
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# FIRST element of the derived range, so listing it would make this
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# assertion fire on every config.
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assertion =
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let
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derived = lib.attrValues hivePorts;
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others = [
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cfg.telemetryPort
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otelCfg.collector.port
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]
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++ lib.optional vmCfg.enable vmCfg.port;
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all = derived ++ others;
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in
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lib.length (lib.unique all) == lib.length all;
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message = ''
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services.hyperhive.swarm.otel: the receiver range starting at
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port (${toString cfg.port}, one port per hive in
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services.hyperhive.swarm.hives) overlaps another port on this
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host.
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Every swarm container shares the host's network namespace, so
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two listeners claiming one port is not a build failure — it is
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whichever process started first, silently. Move
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services.hyperhive.swarm.otel.port to a free range.
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'';
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}
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];
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containers.${cfg.machine} = {
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autoStart = true;
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ephemeral = false;
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# Shared host netns, like every sibling swarm service: the hive tier
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# reaches this collector, and this collector reaches the metrics
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# store, without either crossing a network boundary that would need
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# its own trust material.
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privateNetwork = false;
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# The upstream credential is operator-provided and lives on the host.
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# Read-only, and only when one is configured — binding a path that
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# does not exist makes nixos-container refuse to start the container,
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# which is a stall several layers from its cause.
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bindMounts =
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lib.optionalAttrs (otelCfg.headersCredential != null) {
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${otelCfg.headersCredential} = {
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hostPath = otelCfg.headersCredential;
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isReadOnly = true;
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};
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}
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# The public hive CA, read-only — only when something in here
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# actually verifies a swarm-service name.
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// caTrust.bindMount;
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config =
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{ ... }:
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{
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# This tier is the one that resolves an operator-configured
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# hostname: `otel.endpoint` is an external URL, and reaching it
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# is the entire reason this container holds a credential. The
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# `/etc/resolv.conf` nixos-containers copies in is a snapshot
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# taken once at boot, so without this the upstream export
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# depends on the host's file having been right at that instant.
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imports = [
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(import ./swarm-container-resolver.nix {
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inherit (config.services.hyperhive.network) bridgeIp;
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dnsConsumers = [ "opentelemetry-collector.service" ];
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})
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]
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# `SSL_CERT_FILE` REPLACES the trust store rather than adding to
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# it, so a failed assembly yields an empty pool and every TLS
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# call fails while the unit looks healthy. That is why this is
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# the shared helper — it carries the `Requires` and the
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# non-empty check — and not a local `cat`.
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++ [
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(caTrust.trustBundle {
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inherit pkgs;
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name = cfg.machine;
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consumers = [ "opentelemetry-collector" ];
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})
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];
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system.stateVersion = config.system.stateVersion;
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networking.firewall.enable = false;
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# Keep the host-copied /etc/resolv.conf intact — same reasoning
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# as the sibling swarm containers.
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networking.resolvconf.enable = lib.mkForce false;
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services.opentelemetry-collector = {
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enable = true;
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package = pkgs.opentelemetry-collector-contrib;
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# Runs `otelcol validate` at build time. ⚠️ A parser, not a
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# wiring check: it accepts a receiver naming an absent
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# extension, and the collector then dies at startup. A green
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# build does not prove this config starts, never mind that a
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# sample arrives — which is why this module's gate pushes a
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# real sample through both tiers into the store.
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validateConfigFile = true;
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settings = {
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# One receiver per hive, and that multiplicity is forced
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# rather than chosen. The `hive`
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# label has to come from something the sender cannot write,
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# and the only such thing here is WHICH RECEIVER accepted
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# the sample: a processor cannot read the token's claims
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# (`from_context` reads request metadata, and asking it for
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# an auth claim yields nothing — silently, with a healthy
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# startup), and one receiver holding many credentials never
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# reveals which one matched.
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receivers = lib.mapAttrs' (
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h: p:
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lib.nameValuePair "otlp/${h}" {
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protocols.http = {
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endpoint = "127.0.0.1:${toString p}";
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auth.authenticator = "oidc/${h}";
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};
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}
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) hivePorts;
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exporters =
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lib.optionalAttrs vmCfg.enable {
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# `metrics_endpoint`, NOT `endpoint`: the latter is a
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# base that otlphttp appends `/v1/metrics` to, while
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# VictoriaMetrics serves OTLP at
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# `/opentelemetry/api/v1/push`. With `endpoint` the
|
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# collector answers 200 to its own clients and posts the
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# samples to a path that does not exist. Measured
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# end-to-end, not read — `state/probe-3265-collector-to-vm.sh`.
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"otlphttp/victoriametrics".metrics_endpoint =
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"http://127.0.0.1:${toString vmCfg.port}/opentelemetry/api/v1/push";
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}
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// lib.optionalAttrs (otelCfg.endpoint != "") {
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${if otelCfg.protocol == "grpc" then "otlp" else "otlphttp"} = {
|
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endpoint = otelCfg.endpoint;
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}
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// lib.optionalAttrs (otelCfg.headersCredential != null) {
|
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# Interpolated by the collector from its environment at
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# runtime, never by nix: `EnvironmentFile` below is what
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# puts it there, so the value is not read into the store.
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headers.${otelCfg.collector.upstreamHeaderName} = "\${env:${otelCfg.collector.upstreamHeaderName}}";
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}
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// lib.optionalAttrs (otelCfg.protocol == "http/json") { encoding = "json"; };
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||
};
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# Moves this collector's self-metrics off the built-in
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# default of `localhost:8888`, which the hive tier holds.
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#
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# ⚠️ `metrics.address` is the spelling that looks right and
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# is REJECTED by this collector version — measured, not
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# read: `'migration.MetricsConfigV030' has invalid keys:
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# address`. `readers` is the schema it accepts, and the
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# difference is a startup failure rather than a warning.
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service.telemetry.metrics.readers = [
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{
|
||
pull.exporter.prometheus = {
|
||
host = "127.0.0.1";
|
||
port = cfg.telemetryPort;
|
||
};
|
||
}
|
||
];
|
||
|
||
# ⚠️ An extension that is configured but not listed here is
|
||
# INERT — the collector starts clean and the receiver
|
||
# naming it authenticates nothing. Derived from the same
|
||
# attrset as the receivers so the two cannot disagree.
|
||
service.extensions = map (h: "oidc/${h}") (lib.attrNames hivePorts);
|
||
|
||
# Fan-out, not a choice: with both configured the same
|
||
# samples go upstream AND into the swarm's store. The store
|
||
# is for looking at this swarm; the upstream is for whoever
|
||
# aggregates across swarms, and neither replaces the other.
|
||
# `exporterNames` is shared by every pipeline — where a
|
||
# sample goes is a property of this tier, not of the hive
|
||
# that sent it.
|
||
service.pipelines = lib.mapAttrs' (
|
||
h: _:
|
||
lib.nameValuePair "metrics/${h}" {
|
||
receivers = [ "otlp/${h}" ];
|
||
processors = [ "resource/${h}" ];
|
||
exporters = exporterNames;
|
||
}
|
||
) hivePorts;
|
||
}
|
||
// {
|
||
extensions = lib.mapAttrs' (
|
||
h: _:
|
||
lib.nameValuePair "oidc/${h}" {
|
||
issuer_url = autheliaCfg.url;
|
||
# The audience this hive's client is registered to
|
||
# request, and the reason one hive's token is refused by
|
||
# another hive's receiver. Same expression authelia
|
||
# registers it under — a second spelling here would deny
|
||
# every hive, as a 401 that blames the token.
|
||
audience = "${autheliaCfg.hiveClientPrefix}${h}";
|
||
# ⚠️ `issuer_ca_path`. `issuer_ca_file`, `ca_file` and
|
||
# `tls.ca_file` are all INVALID KEYS for this extension
|
||
# — measured, and the failure is a startup error naming
|
||
# the key rather than anything about certificates.
|
||
issuer_ca_path = caBundle;
|
||
}
|
||
) hivePorts;
|
||
|
||
# `upsert`, not `insert`: a sender that stamps its own
|
||
# `hive` must be OVERWRITTEN, not deferred to. This
|
||
# processor is the whole attribution boundary — the value
|
||
# is a constant per receiver, so it says which hive
|
||
# authenticated, not which hive claimed to be sending.
|
||
processors = lib.mapAttrs' (
|
||
h: _:
|
||
lib.nameValuePair "resource/${h}" {
|
||
attributes = [
|
||
{
|
||
key = "hive";
|
||
value = h;
|
||
action = "upsert";
|
||
}
|
||
# Stamped here rather than on a separate upstream-only
|
||
# pipeline, which would double the pipeline count to
|
||
# withhold one constant label from the local store. It
|
||
# is redundant there — one VictoriaMetrics per swarm, so
|
||
# every series in it already belongs to this swarm — but
|
||
# a constant label multiplies no series, and it means
|
||
# what LEAVES and what STAYS have the same shape.
|
||
#
|
||
# Upstream is where it stops being redundant: that is the
|
||
# one hop where several swarms can land in one store, and
|
||
# samples that cannot name their swarm collide there
|
||
# exactly as hives collided here before per-hive
|
||
# receivers existed.
|
||
{
|
||
key = "swarm";
|
||
value = swarmDisplayName;
|
||
action = "upsert";
|
||
}
|
||
];
|
||
}
|
||
) hivePorts;
|
||
};
|
||
};
|
||
|
||
# The credential file is already `NAME=value`, systemd's
|
||
# EnvironmentFile format — so the secret reaches the process as an
|
||
# environment variable without being read by nix, written to the
|
||
# store, or passed in argv.
|
||
systemd.services.opentelemetry-collector.serviceConfig =
|
||
lib.optionalAttrs (otelCfg.headersCredential != null)
|
||
{
|
||
EnvironmentFile = otelCfg.headersCredential;
|
||
};
|
||
};
|
||
};
|
||
};
|
||
}
|