fix: lowercase DD_SERVICE on processors (#1013)

## What?

Lowercases `DD_SERVICE` for products using it to send telemetry

## Why?

Previous agent did this specifically on Serverless workloads, we should
be consistent – and also #1009

Author: duncanista

bottlecap/src/lifecycle/invocation/processor.rs

@@ -107,7 +107,8 @@ impl Processor {
             &config.service.clone().unwrap_or(resource.clone()),
             "aws.lambda",
             config.trace_aws_service_representation_enabled,
-        );
+        )
+        .to_lowercase();
 
         let enhanced_metrics = EnhancedMetrics::new(metrics_aggregator, Arc::clone(&config));
         enhanced_metrics.start_usage_metrics_task(); // starts the long-running task that monitors usage metrics (fd_use, threads_use, tmp_used)

bottlecap/src/logs/lambda/processor.rs

@@ -64,7 +64,11 @@ impl LambdaProcessor {
         event_bus: Sender<Event>,
         is_managed_instance_mode: bool,
     ) -> Self {
-        let service = datadog_config.service.clone().unwrap_or_default();
+        let service = datadog_config
+            .service
+            .clone()
+            .unwrap_or_default()
+            .to_lowercase();
         let tags = tags_provider.get_tags_string();
         let function_arn = tags_provider.get_canonical_id().unwrap_or_default();
 

bottlecap/src/tags/lambda/tags.rs

@@ -100,7 +100,7 @@ fn tags_from_env(
         tags_map.insert(ENV_KEY.to_string(), env.to_string());
     }
     if let Some(service) = &config.service {
-        tags_map.insert(SERVICE_KEY.to_string(), service.to_string());
+        tags_map.insert(SERVICE_KEY.to_string(), service.to_lowercase());
     }
     if let Ok(init_type) = std::env::var(INIT_TYPE) {
         tags_map.insert(INIT_TYPE_KEY.to_string(), init_type);

bottlecap/src/traces/stats_concentrator_service.rs

@@ -166,7 +166,12 @@ impl StatsConcentratorService {
                 sequence: 0,
                 // Not supported yet
                 agent_aggregation: String::new(),
-                service: self.config.service.clone().unwrap_or_default(),
+                service: self
+                    .config
+                    .service
+                    .clone()
+                    .unwrap_or_default()
+                    .to_lowercase(),
                 container_id: self.tracer_metadata.container_id.clone(),
                 // Not supported yet
                 tags: vec![],