Allow specifying custom namespace for exported metrics

src/bin/cli.rs

@@ -127,6 +127,10 @@ pub struct Opts {
     )]
     pub exporter_metrics_enabled: HashMapSwitch,
 
+    // Exporter metrics namespace
+    #[clap(long = "exporter_metrics_namespace", default_value = "elasticsearch")]
+    pub exporter_metrics_namespace: String,
+
     /// Exporter metadata refresh interval
     #[clap(long = "exporter_metadata_refresh_interval", default_value = "3m")]
     pub exporter_metadata_refresh_interval: humantime::Duration,

src/bin/elasticsearch_exporter.rs

@@ -110,6 +110,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         exporter_skip_zero_metrics: !opts.exporter_allow_zero_metrics,
         exporter_poll_intervals: opts.exporter_poll_intervals.0.clone(),
         exporter_metrics_enabled: opts.exporter_metrics_enabled.0.clone(),
+        exporter_metrics_namespace: opts.exporter_metrics_namespace.clone(),
         exporter_metadata_refresh_interval: *opts.exporter_metadata_refresh_interval,
 
         exporter_metrics_lifetime_interval: opts.exporter_metrics_lifetime_interval.0.clone(),

src/collection/mod.rs

@@ -104,7 +104,7 @@ impl Collection {
                 Opts::new(metric_key, key)
                     .const_labels(self.const_labels.clone())
                     .subsystem(self.subsystem)
-                    .namespace(crate::NAMESPACE),
+                    .namespace(self.options.exporter_metrics_namespace.clone()),
                 &labels.keys().map(|s| s.as_str()).collect::<Vec<&str>>(),
             )?;
 
@@ -171,7 +171,7 @@ impl Collection {
                 Opts::new(metric_key, key)
                     .const_labels(self.const_labels.clone())
                     .subsystem(self.subsystem)
-                    .namespace(crate::NAMESPACE),
+                    .namespace(self.options.exporter_metrics_namespace.clone()),
                 &labels.keys().map(|s| s.as_str()).collect::<Vec<&str>>(),
             )?;
 

src/lib.rs

@@ -72,8 +72,6 @@ pub mod metadata;
 
 pub(crate) mod metrics;
 
-const NAMESPACE: &str = "elasticsearch";
-
 /// Labels type with ordered keys
 pub type Labels = BTreeMap<String, String>;
 

src/options.rs

@@ -37,6 +37,8 @@ pub struct ExporterOptions {
     pub exporter_skip_zero_metrics: bool,
     /// Exporter metrics switch either ON or OFF
     pub exporter_metrics_enabled: ExporterMetricsSwitch,
+    /// Export metrics namespace
+    pub exporter_metrics_namespace: String,
     /// Exporter metadata refresh interval
     pub exporter_metadata_refresh_interval: Duration,