feat: add HTML response handling for job and target endpoints

Signed-off-by: Charlie Le <[email protected]>

.chloggen/otel-targetallocator-html.yaml

@@ -0,0 +1,16 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. collector, target allocator, auto-instrumentation, opamp, github action)
+component: target allocator
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Adds support for HTML output in the target allocator."
+
+# One or more tracking issues related to the change
+issues: [3622]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:

cmd/otel-allocator/allocation/allocator.go

@@ -144,6 +144,7 @@ func (a *allocator) GetTargetsForCollectorAndJob(collector string, job string) [
 }
 
 // TargetItems returns a shallow copy of the targetItems map.
+// The key is the target item's hash, and the value is the target item.
 func (a *allocator) TargetItems() map[string]*target.Item {
 	a.m.RLock()
 	defer a.m.RUnlock()