Merge pull request 'or_else + ? logic to handle two-step env var check' (#23) from hotfix/1307 into rc

Reviewed-on: http://git.enode/deployer3000/integration-module/pulls/23
Reviewed-by: DmitriyA <faleo1999@mail.ru>

crates/api-grub/src/export.rs

@@ -4,7 +4,7 @@ use reqwest::Client;
 use tokio_postgres::NoTls;
 use std::env;
 use anyhow::Result;
-use tracing::{debug, error, info};
+use tracing::{debug, error, info, trace};
 use std::ops::Drop;
 
 /// An entity which handles DB connections.
@@ -113,9 +113,13 @@ impl Exporter {
     }
     /// Exports metrics in `PrometheusMetricsExtended` format to Exporter defined
     /// as env var $EXORPTER_URL 
+    #[tracing::instrument(name = "Prometheus/Status System export")]
     pub async fn export_extended_metrics(metrics: PrometheusMetricsExtended) -> Result<usize> {
         // let url = env::var("EXPORTER_URL")?;
-        let url = env::var("STATUS_SYSTEM_URL").unwrap_or(env::var("EXPORTER_URL")?);
+        let url = env::var("STATUS_SYSTEM_URL").or_else(|err| {
+            trace!("cannot fetch $STATUS_SYSTEM_URL var due to {}. working only with Prometheus exporter link", err);
+            env::var("EXPORTER_URL")
+        })?;
 
         debug!("Exporting: {:?}", &metrics);
 

crates/api-grub/src/monitoring.rs

@@ -277,8 +277,8 @@ impl MonitoringImporter {
             match event.await {
                 Ok(val) => {
                     match crate::export::Exporter::export_extended_metrics(val?).await {
-                        Ok(bytes) => {info!("Successfully transmitted {} bytes to the Prometehus exporter", bytes)},
-                        Err(er) => error!("Cannot export data to the Prometehus exporter due to : `{}`", er),
+                        Ok(bytes) => {info!("Successfully transmitted {} bytes", bytes)},
+                        Err(er) => error!("Cannot export data due to : `{}`", er),
                     }
                 },
                 Err(er) => {