Remove opentelemetry-dynatrace source. (#1321)

We will no longer build/support it as Dynatrace is migrating towards
OTLP ingestion.

Relates #1099

Author: hdost

Cargo.toml

@@ -4,7 +4,6 @@ members = [
     "opentelemetry-aws",
     "opentelemetry-contrib",
     "opentelemetry-datadog",
-    "opentelemetry-dynatrace",
     "opentelemetry-http",
     "opentelemetry-jaeger",
     "opentelemetry-jaeger/examples/actix-udp",

opentelemetry-dynatrace/Cargo.toml

@@ -4,100 +4,13 @@
 
 # Dynatrace
 
-*This is the last release of the crate!*
+The final release of this crate was 0.4.0. Dynatrace now recommends using the OTLP exporter. They also provide a [migration guide]
+For an example on how to configure the OTLP exporter in a Rust application, check out the [Rust integration walk-through] page in the Dynatrace documentation.
 
-[Dynatrace](https://www.dynatrace.com/integrations/opentelemetry) supports native
-OpenTelemetry protocol (OTLP) ingest for traces, metrics and logs.
-All signals can be sent directly to Dynatrace via **OTLP protobuf over HTTP**
-using the built-in OTLP/HTTP Exporter available in the OpenTelemetry Rust SDK.
-More information on configuring your Rust applications to use the OTLP exporter can be found in the
-[Dynatrace documentation](https://www.dynatrace.com/support/help/shortlink/otel-wt-rust).
+[migration guide]: https://www.dynatrace.com/support/help/shortlink/migrating-dynatrace-metrics-exporter-otlp-exporter#migrate-applications
+[Rust integration walk-through]: https://www.dynatrace.com/support/help/shortlink/otel-wt-rust
 
-## Dynatrace OpenTelemetry Metrics Exporter for Rust
 
-![Static Badge](https://img.shields.io/badge/status-deprecated-orange)
-[![Crates.io: opentelemetry-dynatrace](https://img.shields.io/crates/v/opentelemetry-dynatrace.svg)](https://crates.io/crates/opentelemetry-dynatrace)
-[![Documentation](https://docs.rs/opentelemetry-dynatrace/badge.svg)](https://docs.rs/opentelemetry-dynatrace)
-[![LICENSE](https://img.shields.io/crates/l/opentelemetry-dynatrace)](./LICENSE)
-[![GitHub Actions CI](https://github.com/open-telemetry/opentelemetry-rust/workflows/CI/badge.svg)](https://github.com/open-telemetry/opentelemetry-rust/actions?query=workflow%3ACI+branch%3Amain)
-[![Slack](https://img.shields.io/badge/slack-@cncf/otel/rust-brightgreen.svg?logo=slack)](https://cloud-native.slack.com/archives/C03GDP0H023)
+## Notice Removal
 
-> **Warning**
-> Dynatrace supports native OpenTelemetry protocol (OTLP) ingest for traces, metrics and logs.
-> Therefore, the proprietary Dynatrace OpenTelemetry metrics exporter is deprecated in favor of exporting via OTLP/HTTP.
->
-> The exporter is still available but after the end of 2023, no support, updates, or compatibility with newer OTel versions will be provided.
->
-> Please refer to the [migration guide](https://www.dynatrace.com/support/help/shortlink/migrating-dynatrace-metrics-exporter-otlp-exporter#migrate-applications) for instructions on how to migrate to the OTLP HTTP exporter, as well as reasoning and benefits for this transition.
->
-> For an example on how to configure the OTLP exporter in a Rust application, check out the [Rust integration walk-through](https://www.dynatrace.com/support/help/shortlink/otel-wt-rust) page in the Dynatrace documentation.
-
-### Overview
-
-[`OpenTelemetry`] is a collection of tools, APIs, and SDKs used to instrument,
-generate, collect, and export telemetry data (metrics, logs, and traces) for
-analysis in order to understand your software's performance and behavior. This
-crate provides additional propagators and exporters for sending telemetry data
-to [`Dynatrace`].
-
-### Exporter features
-
-* **Metrics** - Ingest metric data to Dynatrace using the [Dynatrace Metrics ingestion protocol].
-
-This exporter only supports the ingestion of metric data. For trace data, use
-[`opentelemetry-otlp`] as described in the
-[Dynatrace documentation for Rust]. This exporter is based on the OpenTelemetry
-Metrics SDK for Rust, which is currently in an alpha state and neither
-considered stable nor complete as of this writing. As such, this exporter is
-not intended for production use until the underlying OpenTelemetry Metrics API
-and SDK are stable. See [`open-telemetry/opentelemetry-rust`] for the current
-state of the OpenTelemetry SDK for Rust.
-
-[Dynatrace]: https://www.dynatrace.com/
-[Dynatrace Metrics ingestion protocol]: https://www.dynatrace.com/support/help/how-to-use-dynatrace/metrics/metric-ingestion/metric-ingestion-protocol/
-[Dynatrace documentation for Rust]: https://www.dynatrace.com/support/help/shortlink/opent-rust
-[`open-telemetry/opentelemetry-rust`]: https://github.com/open-telemetry/opentelemetry-rust
-
-#### Examples
-
-The examples directory contains an [advanced example](../examples/dynatrace)
-showing the ingestion of trace data and metric data together.
-
-[`opentelemetry-otlp`]: https://crates.io/crates/opentelemetry-otlp
-[`opentelemetry-dynatrace`]: https://crates.io/crates/opentelemetry-dynatrace
-
-### Performance
-
-For optimal performance, a batch exporter is used. You can enable the `rt-tokio`
-feature flag to use the [`tokio`] runtime, or enable the `rt-async-std` feature
-flag to use the [`async-std`] runtime to have a batch exporter configured for
-you automatically.
-
-[`tokio`]: https://tokio.rs
-[`async-std`]: https://async.rs
-
-### Choosing an HTTP client
-
-The HTTP client that this exporter will use can be overridden with feature
-flags. By default the `reqwest-client` feature flag is enabled which will use
-the [`reqwest`] http client.
-
-- `reqwest-client` (enabled by default): use the [`reqwest`] http client to send metric data.
-- `reqwest-tls` (enabled by default): use the [`reqwest`] http client with [`rustls`] to enable TLS support.
-- `reqwest-blocking-client`: use the [`reqwest`] blocking http client to send metric data.
-- `isahc-client`: use the [`isahc`] http client to send metric data.
-- `surf-client`: use the [`surf`] http client to send metric data.
-
-You can also configure your own http client implementation using the `HttpClient` trait.
-
-[`reqwest`]: https://docs.rs/reqwest/latest/reqwest/
-[`rustls`]: https://docs.rs/rustls/latest/rustls/
-[`isahc`]: https://docs.rs/isahc/latest/isahc/
-[`surf`]: https://docs.rs/surf/latest/surf/
-
-### WebAssembly
-
-WebAssembly support can be enabled with the `wasm` feature flag.
-
-[`Dynatrace`]: https://www.dynatrace.com/
-[`OpenTelemetry`]: https://crates.io/crates/opentelemetry
+This README and directory can be removed after any time in 2024 at least 6 months from the last release date of `opentelemetry-dynatrace`.