Deprecate zipkin exporter

Author: liudmila molkova

spec-compliance-matrix.md

@@ -334,8 +334,8 @@ Disclaimer: Declarative configuration is currently in Development status - work
 | **[Zipkin](specification/trace/sdk_exporters/zipkin.md)** | Optional | Go | Java | JS | Python | Ruby | Erlang | PHP | Rust | C++ | .NET | Swift |
 | Zipkin V1 JSON | X | - | + |  | + | - | - | - | - | - | - | - |
 | Zipkin V1 Thrift | X | - | + |  | [-][py1174] | - | - | - | - | - | - | - |
-| Zipkin V2 JSON | * | + | + |  | + | + | - | + | + | + | + | + |
-| Zipkin V2 Protobuf | * | - | + |  | + | - | + | - | - | - | - | - |
+| Zipkin V2 JSON | X | + | + |  | + | + | - | + | + | + | + | + |
+| Zipkin V2 Protobuf | X | - | + |  | + | - | + | - | - | - | - | - |
 | Service name mapping |  | + | + | + | + | + | + | + | + | + | + | + |
 | SpanKind mapping |  | + | + | + | + | + | + | + | + | + | + | + |
 | InstrumentationLibrary mapping |  | + | + | - | + | + | - | + | + | + | + | + |

spec-compliance-matrix/template.yaml

@@ -375,9 +375,9 @@ sections:
           - name: Zipkin V1 Thrift
             optional: true
           - name: Zipkin V2 JSON
-            optional_one_of_group_is_required: true
+            optional: true
           - name: Zipkin V2 Protobuf
-            optional_one_of_group_is_required: true
+            optional: true
           - name: Service name mapping
           - name: SpanKind mapping
           - name: InstrumentationLibrary mapping

specification/trace/sdk_exporters/zipkin.md

@@ -4,7 +4,14 @@ linkTitle: Zipkin
 
 # OpenTelemetry to Zipkin Transformation
 
-**Status**: [Stable](../../document-status.md)
+**Status**: [Deprecated](../../document-status.md)
+
+Zipkin exporter support will be removed from OpenTelemetry in Jan 2027.
+
+_Note: This document remains here for backwards compatibility and
+will be removed in a future version. SDKs MAY include Zipkin exporters,
+but Zipkin export is not required.
+Users may export to Zipkin using [zipkin-otel](https://github.com/openzipkin-contrib/zipkin-otel)_
 
 This document defines the transformation between OpenTelemetry and Zipkin Spans.
 The generic transformation [rules specified here](../../common/mapping-to-non-otlp.md) also apply. If a