From 3468c9b873388de4e9c3656e2952302d0f719736 Mon Sep 17 00:00:00 2001
From: isobelormiston <isobel@thoughtmachine.net>
Date: Tue, 22 Aug 2023 17:23:06 +0100
Subject: [PATCH] Initialise vector metrics (#258)

---
 ChangeLog               | 4 ++++
 VERSION                 | 2 +-
 mettle/worker/worker.go | 5 +++++
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 0114894a..2eae7ba4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Version 11.2.2
+--------------
+    * Correctly initialise Prometheus Vector metrics
+
 Version 11.2.1
 --------------
     * Temporarily increase Elan ctx timeout
diff --git a/VERSION b/VERSION
index 6a60423c..e4bec135 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-11.2.1
\ No newline at end of file
+11.2.2
\ No newline at end of file
diff --git a/mettle/worker/worker.go b/mettle/worker/worker.go
index 6e36f598..740e1220 100644
--- a/mettle/worker/worker.go
+++ b/mettle/worker/worker.go
@@ -355,6 +355,11 @@ func initialiseWorker(instanceName, requestQueue, responseQueue, name, storage,
 	for name, cost := range costs {
 		w.costs[name] = &bbru.MonetaryResourceUsage_Expense{Currency: cost.Denomination, Cost: cost.Amount}
 	}
+
+	// Vector metrics need initialising explicitly with labels. See https://github.com/prometheus/client_golang/blob/main/prometheus/examples_test.go#L51-L73
+	currentBuilds.WithLabelValues(w.instanceName).Add(0)
+	blobNotFoundErrors.WithLabelValues(w.version).Add(0)
+
 	log.Notice("%s initialised with settings: CAS: %s cache dir: %s max cache size: %d sandbox: %s alt sandbox: %s", name, storage, cacheDir, maxCacheSize, w.sandbox, w.altSandbox)
 	return w, nil
 }