Restore support for the memcached/metrics input. (#2298) (#2299)

* Restore support for memcached/metrics input.

* Add PR and issue to changelog.

(cherry picked from commit cb63711)

Co-authored-by: Craig MacKenzie <craig.mackenzie@elastic.co>

changelog/fragments/1677000534-Restore-support-for-memcached-metrics-inputs.yaml

@@ -0,0 +1,27 @@
+# Kind can be one of:
+# - breaking-change: a change to previously-documented behavior
+# - deprecation: functionality that is being removed in a later release
+# - bug-fix: fixes a problem in a previous version
+# - enhancement: extends functionality but does not break or fix existing behavior
+# - feature: new functionality
+# - known-issue: problems that we are aware of in a given version
+# - security: impacts on the security of a product or a user’s deployment.
+# - upgrade: important information for someone upgrading from a prior version
+# - other: does not fit into any of the other categories
+kind: bug-fix
+
+# Change summary; a 80ish characters long description of the change.
+summary: Restore support for memcached/metrics inputs.
+
+# Affected component; a word indicating the component this changeset affects.
+component: Elastic agent.
+
+# PR URL; optional; the PR number that added the changeset.
+# If not present is automatically filled by the tooling finding the PR where this changelog fragment has been added.
+# NOTE: the tooling supports backports, so it's able to fill the original PR number instead of the backport PR number.
+# Please provide it if you are adding a fragment for a different PR.
+pr: https://github.com/elastic/elastic-agent/pull/2298
+
+# Issue URL; optional; the GitHub issue related to this changeset (either closes or is part of).
+# If not present is automatically filled by the tooling with the issue linked to the PR number.
+issue: https://github.com/elastic/elastic-agent/issues/2293

specs/metricbeat.spec.yml

@@ -225,6 +225,12 @@ inputs:
     outputs: *outputs
     shippers: *shippers
     command: *command
+  - name: memcached/metrics
+    description: "Memcached metrics"
+    platforms: *platforms
+    outputs: *outputs
+    shippers: *shippers
+    command: *command
   - name: nats/metrics
     description: "NATS metrics"
     platforms: *platforms