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nixos/prometheus: filter out empty srcape_configs attributes

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This results in a smaller prometheus.yml config file.

It also allows us to use the same options for both prometheus-1 and
prometheus-2 since the new options for prometheus-2 default to null
and will be filtered out if they are not set.
This commit is contained in:
Bas van Dijk 2019-04-16 16:06:11 +02:00
parent a23db5db08
commit a913d0891c
1 changed files with 17 additions and 2 deletions
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19
nixos/modules/services/monitoring/prometheus/default.nix
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@ -54,7 +54,7 @@ let
rule_files = map (promtoolCheck "check-rules" "rules") (cfg.ruleFiles ++ [
(pkgs.writeText "prometheus.rules" (concatStringsSep "\n" cfg.rules))
]);
scrape_configs = cfg.scrapeConfigs;
scrape_configs = filterEmpty cfg.scrapeConfigs;
};
generatedPrometheusYml = writePrettyJSON "prometheus.yml" promConfig;
@ -81,7 +81,7 @@ let
rule_files = map (prom2toolCheck "check rules" "rules") (cfg2.ruleFiles ++ [
(pkgs.writeText "prometheus.rules" (concatStringsSep "\n" cfg2.rules))
]);
scrape_configs = cfg2.scrapeConfigs;
scrape_configs = filterEmpty cfg2.scrapeConfigs;
alerting = optionalAttrs (cfg2.alertmanagerURL != []) {
alertmanagers = [{
static_configs = [{
@ -108,6 +108,21 @@ let
] ++
optional (cfg2.webExternalUrl != null) "--web.external-url=${cfg2.webExternalUrl}";
filterEmpty = filterAttrsListRecursive (_n: v: !(v == null || v == [] || v == {}));
filterAttrsListRecursive = pred: x:
if isAttrs x then
listToAttrs (
concatMap (name:
let v = x.${name}; in
if pred name v then [
(nameValuePair name (filterAttrsListRecursive pred v))
] else []
) (attrNames x)
)
else if isList x then
map (filterAttrsListRecursive pred) x
else x;
promTypes.globalConfig = types.submodule {
options = {
scrape_interval = mkOption {