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Various blackbox exporter improvements #256

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Merged
merged 4 commits into from
May 22, 2025
Merged

Various blackbox exporter improvements #256

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fac6893
prometheus: rename names to domains
SuperSandro2000 May 22, 2025
1423242
prometheus: add some comments
SuperSandro2000 May 22, 2025
04ec149
prometheus: remove redundant inherit
SuperSandro2000 May 22, 2025
dda2067
prometheus: add labels to allow grouping by domain
SuperSandro2000 May 22, 2025
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30 changes: 19 additions & 11 deletions modules/prometheus.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@ in
dnsProbe = lib.mkOption {
type = with lib.types; attrsOf (submodule {
options = {
names = lib.mkOption {
domains = lib.mkOption {
type = with lib.types; listOf str;
example = [ "example.com" ];
description = "Query name to query";
Expand Down Expand Up @@ -109,17 +109,17 @@ in
exporters.blackbox = {
config.modules = lib.mkMerge (
(lib.mapAttrsToList (probeName: opts:
(lib.foldl (x: name: x // {
"dns_${probeName}_${name}" = {
(lib.foldl (x: domain: x // {
"dns_${probeName}_${domain}" = {
dns = {
query_name = name;
query_name = domain;
query_type = opts.type;
valid_rcodes = [ "NOERROR" ];
};
prober = "dns";
timeout = "5s";
};
}) { } opts.names)
}) { } opts.domains)
) cfgb.dnsProbe)

++ lib.mapAttrsToList (name: opts: let
Expand Down Expand Up @@ -162,34 +162,42 @@ in
metrics_path = "/probe";
relabel_configs = [ {
source_labels = [ "__address__" ];
target_label = "__param_target";
target_label = "__param_target"; # __param_* will be rewritten as query string
} {
source_labels = [ "__param_target" ];
target_label = "instance";
} {
# needed because blackbox exporter (ab)uses targets for its targets but we actually need to ask the exporter about the target state
target_label = "__address__";
replacement = cfgb.blackboxExporterURL;
} ];
};

genHttpProbeScrapeConfig = { name, opts }: commonProbeScrapeConfig // {
job_name = "blackbox_http_${name}";
params.module = [ "http_${name}" ];
inherit (commonProbeScrapeConfig) relabel_configs;
relabel_configs = commonProbeScrapeConfig.relabel_configs ++ [ {
source_labels = [ "__param_target" ];
regex = "https?://(.*)";
target_label = "domain";
} ];
static_configs = [ {
targets = opts.urls;
} ];
};
in lib.flatten (lib.foldl (x: probe: x ++ [
(lib.foldl (x: name: x ++ [
(lib.foldl (x: domain: x ++ [
(commonProbeScrapeConfig // {
job_name = "blackbox_dns_${probe.name}_${name}";
params.module = [ "dns_${probe.name}_${name}" ];
job_name = "blackbox_dns_${probe.name}_${domain}";
params.module = [ "dns_${probe.name}_${domain}" ];
static_configs = [ {
labels = { inherit domain; };
inherit (probe.value) targets;
} ];
})
]) [ ] probe.value.names)
]) [ ] probe.value.domains)
]) [ ] (lib.attrsToList cfgb.dnsProbe))

++ lib.filter (v: v != null) (lib.mapAttrsToList (name: opts:
if (opts.ip == "both" || opts.ip == "ip4") then (genHttpProbeScrapeConfig { inherit name opts; }) else null
) cfgb.httpProbe
Expand Down