add blogpost on migrating away from the Jaeger exporter (#3273)

Co-authored-by: Severin Neumann <[email protected]>
Co-authored-by: Pablo Baeyens <[email protected]>
Co-authored-by: Phillip Carter <[email protected]>

content/en/blog/2023/jaeger-exporter-collector-migration.md

@@ -0,0 +1,72 @@
+---
+title: Migrating away from the Jaeger exporter in the Collector
+linkTitle: Jaeger Collector Exporter Migration
+date: 2023-09-14
+author: >-
+  [Alex Boten](https://github.com/codeboten) (Lightstep)
+cSpell:ignore: Boten gomod jaegerexporter jaegerthrifthttpexporter
+---
+
+The
+[latest binary](https://github.com/open-telemetry/opentelemetry-collector-releases/releases/tag/v0.85.0)
+release of the OpenTelemetry Collector no longer includes exporters for the
+native Jaeger format. This change was prompted because Jaeger has support for
+OTLP out of the box. If you are a current user of either the Jaeger or Jaeger
+Thrift exporter, you have a couple of options to choose from when upgrading to
+the latest Collector.
+
+## Switch to OTLP exporter
+
+The recommended option is to switch to the OpenTelemetry Protocol exporter. This
+exporter is included in all the official distributions supported by the
+community. To switch, you'll need to update the collector configuration. Find
+the following Jaeger exporter configuration:
+
+```yaml
+exporters:
+  jaeger:
+    endpoint: https://jaeger.example.com:14250
+
+service:
+  pipelines:
+    exporters: [jaeger]
+```
+
+And replace it with the OTLP configuration:
+
+```yaml
+exporters:
+  otlp/jaeger: # Jaeger supports OTLP directly. The default port for OTLP/gRPC is 4317
+    endpoint: https://jaeger.example.com:4317
+
+service:
+  pipelines:
+    exporters: [otlp/jaeger]
+```
+
+Versions of Jaeger until v1.46.0, need the following environment variable set
+`COLLECTOR_OTLP_ENABLED=true`.
+
+## Build a custom Collector
+
+If switching to the OTLP exporter isn't an option, an alternative is to build a
+custom Collector that includes the Jaeger exporter. The process to build is
+documented [here](/docs/collector/custom-collector/). Your manifest file will
+need to include the following line to add the Jaeger exporter:
+
+```yaml
+exporters:
+  - gomod: go.opentelemetry.io/collector/exporter/jaegerexporter v0.85.0
+  - gomod:
+      go.opentelemetry.io/collector/exporter/jaegerthrifthttpexporter v0.85.0
+```
+
+Further example of manifest files for existing Collector distributions can be
+found in the
+[opentelemetry-collector-releases](https://github.com/open-telemetry/opentelemetry-collector-releases/blob/main/distributions/otelcol)
+repository.
+
+If either of these options do not work for your use-case, please reach out to
+the [#otel-collector](https://cloud-native.slack.com/archives/C01N6P7KR6W)
+community via [CNCF Slack](https://slack.cncf.io) or open an issue in the
+[repository](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/new/choose).