remove async_trait as dependency

Author: lalitb

opentelemetry-sdk/Cargo.toml

@@ -13,7 +13,7 @@ rust-version = "1.70"
 opentelemetry = { version = "0.27", path = "../opentelemetry/" }
 opentelemetry-http = { version = "0.27", path = "../opentelemetry-http", optional = true }
 async-std = { workspace = true, features = ["unstable"], optional = true }
-async-trait = { workspace = true }
+async-trait = { workspace = true, optional = true }
 futures-channel = "0.3"
 futures-executor = { workspace = true }
 futures-util = { workspace = true, features = ["std", "sink", "async-await-macro"] }
@@ -43,11 +43,11 @@ pprof = { version = "0.13", features = ["flamegraph", "criterion"] }
 
 [features]
 default = ["trace", "metrics", "logs", "internal-logs"]
-trace = ["opentelemetry/trace", "rand",  "percent-encoding"]
+trace = ["opentelemetry/trace", "rand", "percent-encoding"]
 jaeger_remote_sampler = ["trace", "opentelemetry-http", "http", "serde", "serde_json", "url"]
-logs = ["opentelemetry/logs", "serde_json"]
+logs = ["opentelemetry/logs", "async-trait", "serde_json"]
 spec_unstable_logs_enabled = ["logs", "opentelemetry/spec_unstable_logs_enabled"]
-metrics = ["opentelemetry/metrics", "glob"]
+metrics = ["opentelemetry/metrics", "glob", "async-trait"]
 testing = ["opentelemetry/testing", "trace", "metrics", "logs", "rt-async-std", "rt-tokio", "rt-tokio-current-thread", "tokio/macros", "tokio/rt-multi-thread"]
 rt-tokio = ["tokio", "tokio-stream"]
 rt-tokio-current-thread = ["tokio", "tokio-stream"]

opentelemetry-sdk/src/trace/span_processor.rs

@@ -727,7 +727,6 @@ mod tests {
         OTEL_BSP_MAX_CONCURRENT_EXPORTS_DEFAULT, OTEL_BSP_MAX_EXPORT_BATCH_SIZE_DEFAULT,
     };
     use crate::trace::{BatchConfig, BatchConfigBuilder, SpanEvents, SpanLinks};
-    use async_trait::async_trait;
     use opentelemetry::trace::{SpanContext, SpanId, SpanKind, Status};
     use std::fmt::Debug;
     use std::future::Future;
@@ -963,7 +962,6 @@ mod tests {
         }
     }
 
-    #[async_trait]
     impl<D, DS> SpanExporter for BlockingExporter<D>
     where
         D: Fn(Duration) -> DS + 'static + Send + Sync,