deprecation notice in readme (#173)

README.md

@@ -4,25 +4,23 @@
 [![Release](https://github.com/canonical/tempo-k8s-operator/actions/workflows/release.yaml/badge.svg)](https://github.com/canonical/tempo-k8s-operator/actions/workflows/release.yaml)
 [![Discourse Status](https://img.shields.io/discourse/status?server=https%3A%2F%2Fdiscourse.charmhub.io&style=flat&label=CharmHub%20Discourse)](https://discourse.charmhub.io)
 
-This repository contains the source code for a Charmed Operator that drives [Tempo] on Kubernetes.
+This public archive contains the source code for a Charmed Operator that drives a monolithic deployment of [Tempo] on Kubernetes.
 
-## Usage
+The charm has been superseded by the [Charmed Tempo HA solution](https://discourse.charmhub.io/t/charmed-tempo-ha/15531), consisting of two charms:
+- `tempo-coordinator-k8s`
+  - [github](https://github.com/canonical/tempo-coordinator-k8s-operator/)
+  - [charmhub](https://charmhub.io/tempo-coordinator-k8s-operator/)
+- `tempo-worker-k8s`
+  - [github](https://github.com/canonical/tempo-worker-k8s-operator)
+  - [charmhub](https://charmhub.io/tempo-worker-k8s-operator)
 
-Assuming you have access to a bootstrapped Juju controller on Kubernetes, you can:
+This charm is now unmaintained.
 
-```bash
-$ juju deploy tempo-k8s # --trust (use when cluster has RBAC enabled)
-```
+All charm libraries that used to be owned by it have been transferred to the `tempo-coordinator-k8s` ownership and their versions have been reset.
 
-## OCI Images
+| library       | old location                      | new location                                  |
+|---------------|:----------------------------------|-----------------------------------------------|
+| tracing       | charms.tempo_k8s.v2.tracing       | charms.tempo_coordinator_k8s.v0.tracing       |
+| charm_tracing | charms.tempo_k8s.v1.charm_tracing | charms.tempo_coordinator_k8s.v0.charm_tracing |
 
-This charm, by default, deploys `grafana/tempo:2.4.0`.
-
-## Contributing
-
-Please see the [Juju SDK docs](https://juju.is/docs/sdk) for guidelines
-on enhancements to this charm following best practice guidelines, and the
-[contributing] doc for developer guidance.
-
-[Tempo]: https://grafana.com/traces/
-[contributing]: https://github.com/PietroPasotti/tempo-k8s-operator/blob/main/CONTRIBUTING.md
+The APIs are unchanged, so after fetching the new libraries, a search and replace should be all you need.