harmony/src/modules/monitoring/kube_prometheus/helm/config.rs

@@ -26,6 +26,7 @@ pub struct KubePrometheusConfig {
     pub prometheus_operator: bool,
     pub alert_receiver_configs: Vec<AlertManagerChannelConfig>,
     pub alert_rules: Vec<AlertManagerAdditionalPromRules>,
+    pub additional_service_monitors: Vec<ServiceMonitor>,
 }
 impl KubePrometheusConfig {
     pub fn new() -> Self {
@@ -49,6 +50,7 @@ impl KubePrometheusConfig {
             kube_scheduler: false,
             alert_receiver_configs: vec![],
             alert_rules: vec![],
+            additional_service_monitors: vec![],
         }
     }
 }

harmony/src/modules/monitoring/kube_prometheus/helm/kube_prometheus_helm_chart.rs

@@ -12,7 +12,7 @@ use crate::modules::{
     helm::chart::HelmChartScore,
     monitoring::kube_prometheus::types::{
         AlertGroup, AlertManager, AlertManagerAdditionalPromRules, AlertManagerConfig,
-        AlertManagerRoute, AlertManagerValues,
+        AlertManagerRoute, AlertManagerValues, PrometheusConfig,
     },
 };
 
@@ -101,10 +101,23 @@ nodeExporter:
   enabled: {node_exporter}
 prometheusOperator:
   enabled: {prometheus_operator}
-prometheus:
-  enabled: {prometheus}
 "#,
     );
+    let prometheus_config =
+        crate::modules::monitoring::kube_prometheus::types::PrometheusConfigValues {
+            prometheus: PrometheusConfig {
+                prometheus,
+                additional_service_monitors: config.additional_service_monitors.clone(),
+            },
+        };
+    let prometheus_config_yaml =
+        serde_yaml::to_string(&prometheus_config).expect("Failed to serialize YAML");
+
+    debug!(
+        "serialized prometheus config: \n {:#}",
+        prometheus_config_yaml
+    );
+    values.push_str(&prometheus_config_yaml);
 
     // add required null receiver for prometheus alert manager
     let mut null_receiver = Mapping::new();

harmony/src/modules/monitoring/kube_prometheus/types.rs

@@ -1,6 +1,7 @@
 use std::collections::BTreeMap;
 
 use async_trait::async_trait;
+use harmony_macros::ingress_path;
 use serde::Serialize;
 use serde_yaml::{Mapping, Sequence, Value};
 
@@ -53,3 +54,138 @@ pub struct AlertManagerAdditionalPromRules {
 pub struct AlertGroup {
     pub groups: Vec<AlertManagerRuleGroup>,
 }
+
+#[derive(Debug, Clone, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PrometheusConfigValues {
+    pub prometheus: PrometheusConfig,
+}
+
+#[derive(Debug, Clone, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PrometheusConfig {
+    pub prometheus: String,
+    pub additional_service_monitors: Vec<ServiceMonitor>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ServiceMonitorTLSConfig {
+    // ## Path to the CA file
+    // ##
+    pub ca_file: String,
+
+    // ## Path to client certificate file
+    // ##
+    pub cert_file: String,
+
+    // ## Skip certificate verification
+    // ##
+    pub insecure_skip_verify: bool,
+
+    // ## Path to client key file
+    // ##
+    pub key_file: String,
+
+    // ## Server name used to verify host name
+    // ##
+    pub server_name: String,
+}
+
+#[derive(Debug, Clone, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ServiceMonitorEndpoint {
+    // ## Name of the endpoint's service port
+    // ## Mutually exclusive with targetPort
+    pub port: String,
+
+    // ## Name or number of the endpoint's target port
+    // ## Mutually exclusive with port
+    pub target_port: String,
+
+    // ## File containing bearer token to be used when scraping targets
+    // ##
+    pub bearer_token_file: String,
+
+    // ## Interval at which metrics should be scraped
+    // ##
+    pub interval: String,
+
+    // ## HTTP path to scrape for metrics
+    // ##
+    pub path: String,
+
+    // ## HTTP scheme to use for scraping
+    // ##
+    pub scheme: String,
+
+    // ## TLS configuration to use when scraping the endpoint
+    // ##
+    pub tls_config: ServiceMonitorTLSConfig,
+
+    // ## MetricRelabelConfigs to apply to samples after scraping, but before ingestion.
+    // ## ref: https://github.com/prometheus-operator/prometheus-operator/blob/main/Documentation/api-reference/api.md#relabelconfig
+    // ##
+    // # - action: keep
+    // #   regex: 'kube_(daemonset|deployment|pod|namespace|node|statefulset).+'
+    // #   sourceLabels: [__name__]
+    pub metric_relabelings: Vec<Mapping>,
+
+    // ## RelabelConfigs to apply to samples before scraping
+    // ## ref: https://github.com/prometheus-operator/prometheus-operator/blob/main/Documentation/api-reference/api.md#relabelconfig
+    // ##
+    // # - sourceLabels: [__meta_kubernetes_pod_node_name]
+    // #   separator: ;
+    // #   regex: ^(.*)$
+    // #   targetLabel: nodename
+    // #   replacement: $1
+    // #   action: replace
+    pub relabelings: Vec<Mapping>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ServiceMonitor {
+    pub name: String,
+
+    // # Additional labels to set used for the ServiceMonitorSelector. Together with standard labels from the chart
+    pub additional_labels: Mapping,
+
+    // # Service label for use in assembling a job name of the form <label value>-<port>
+    // # If no label is specified, the service name is used.
+    pub job_label: String,
+
+    // # labels to transfer from the kubernetes service to the target
+    pub target_labels: Vec<String>,
+
+    // # labels to transfer from the kubernetes pods to the target
+    pub pod_target_labels: Vec<String>,
+
+    // # Label selector for services to which this ServiceMonitor applies
+    //   # Example which selects all services to be monitored
+    //   # with label "monitoredby" with values any of "example-service-1" or "example-service-2"
+    //   matchExpressions:
+    //     - key: "monitoredby"
+    //       operator: In
+    //       values:
+    //         - example-service-1
+    //         - example-service-2
+    pub selector: Mapping,
+
+    //   # label selector for services
+    pub match_labels: Mapping,
+
+    // # Namespaces from which services are selected
+    //   # Match any namespace
+    //   any: bool,
+    //   # Explicit list of namespace names to select
+    //   matchNames: Vec,
+    pub namespace_selector: Mapping,
+
+    // # Endpoints of the selected service to be monitored
+    pub endpoints: Vec<ServiceMonitorEndpoint>,
+
+    // # Fallback scrape protocol used by Prometheus for scraping metrics
+    // # ref: https://github.com/prometheus-operator/prometheus-operator/blob/main/Documentation/api-reference/api.md#monitoring.coreos.com/v1.ScrapeProtocol
+    pub fallback_scrape_protocol: String,
+}

harmony_macros/src/lib.rs

@@ -133,6 +133,26 @@ pub fn ingress_path(input: TokenStream) -> TokenStream {
     }
 }
 
+/// Verify that a string is a valid http scheme
+/// Panics if not http or https
+#[proc_macro]
+pub fn http_scheme(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as LitStr);
+    let scheme_str = input.value();
+
+    if scheme_str.to_lowercase() == "http" {
+        let expanded = quote! {(#scheme_str.to_lowercase().to_string()) };
+        return TokenStream::from(expanded);
+    }
+
+    if scheme_str.to_lowercase() == "https" {
+        let expanded = quote! {(#scheme_str.to_lowercase().to_string()) };
+        return TokenStream::from(expanded);
+    }
+
+    panic!("Invalid HTTP scheme")
+}
+
 #[proc_macro]
 pub fn cidrv4(input: TokenStream) -> TokenStream {
     let input = parse_macro_input!(input as LitStr);