optional TERASLICE_DISPLAY_URL env parameter for metric url labels

README.md

@@ -10,6 +10,7 @@ So far it works like this:
 
 ```bash
 TERASLICE_URL="https://localhost" \
+TERASLICE_DISPLAY_URL="https://teraslice-xyz.lan" \
   DEBUG=True \
   NODE_EXTRA_CA_CERTS=/path/to/ca.crt \
   node dist/index.js | bunyan
@@ -19,6 +20,7 @@ All options are passed as environment variables
 
 ```bash
 TERASLICE_URL="https://localhost" \
+TERASLICE_DISPLAY_URL="https://teraslice-xyz.lan" \
   DEBUG=True \
   NODE_EXTRA_CA_CERTS=/path/to/ca.crt \
   PORT=4242 \
@@ -31,6 +33,7 @@ The `TERASLICE_URL` is the only environment variable that is required.
 ### Environment variables
 
 * `TERASLICE_URL` - URL to the Teraslice Instance to Monitor
+* `TERASLICE_DISPLAY_URL` - Optional override of TERASLICE_URL for metric label purposes only
 * `DEBUG` - Enable debug logging
 * `NODE_EXTRA_CA_CERTS` - Standard Node variable to specify CA cert for SSL
 connections

src/index.ts

@@ -11,6 +11,7 @@ declare let process : {
         DEBUG: string,
         PORT: number,
         TERASLICE_URL: string
+        TERASLICE_DISPLAY_URL: string
         TERASLICE_QUERY_DELAY: number
     }
 };

src/metrics.ts

@@ -435,8 +435,14 @@ function generateExecutionVersions(terasliceStats:TerasliceStats, labels:any) {
 export function updateTerasliceMetrics(terasliceStats: TerasliceStats): void {
     metricsRegistry.resetMetrics();
 
+    let baseURLLabel = terasliceStats.baseUrl.toString()
+
+    if (process?.env?.TERASLICE_DISPLAY_URL) {
+        baseURLLabel = process?.env?.TERASLICE_DISPLAY_URL?.toLowerCase()
+    }
+
     const globalLabels = {
-        url: terasliceStats.baseUrl.toString(),
+        url: baseURLLabel,
         name: terasliceStats.info.name,
     };
     // NOTE: This set of labels expands out to including 'name' twice, right now