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[SVLS-8582] feat(logs): change default of durable log buffer size from 0 to 5 #1324

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[SVLS-8582] feat(logs): change default of durable log buffer size from 0 to 5 #1324

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e1ae1c6
feat(logs): default DD_LAMBDA_DURABLE_FUNCTION_LOG_BUFFER_SIZE to 5
lym953 Aug 13, 2026
cec66bb
docs: clarify when the durable log buffer applies
lym953 Aug 25, 2026
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9 changes: 5 additions & 4 deletions bottlecap/src/config/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -77,8 +77,9 @@ pub struct LambdaConfig {

/// Maximum number of request IDs whose logs are held in `held_logs` waiting for durable
/// execution context. Set to 0 to disable log holding; logs will be flushed immediately
/// without durable execution context enrichment. Defaults to 0 until the tracer-side
/// durable execution support is released; set to 50 to re-enable enrichment.
/// without durable execution context enrichment. Holding begins at cold start, before the
/// extension knows whether the function is durable, and stops for non-durable functions
/// once `PlatformInitStart` resolves that.
pub lambda_durable_function_log_buffer_size: usize,

// Data Streams Monitoring
Expand Down Expand Up @@ -120,7 +121,7 @@ impl Default for LambdaConfig {
api_security_enabled: true,
api_security_sample_delay: Duration::from_secs(30),
custom_metrics_exclude_tags: Vec::new(),
lambda_durable_function_log_buffer_size: 0,
lambda_durable_function_log_buffer_size: 5,
dsm_consume_enabled: false,
dsm_exchange_name: None,
dsm_kafka_group: None,
Expand Down Expand Up @@ -197,7 +198,7 @@ pub struct LambdaConfigSource {

/// `DD_LAMBDA_DURABLE_FUNCTION_LOG_BUFFER_SIZE` — max number of request IDs
/// whose logs are held waiting for durable execution context. Defaults to
/// 0 (hold mechanism disabled).
/// 5; set to 0 to disable the hold mechanism.
#[serde(deserialize_with = "deser_opt_lossless")]
pub lambda_durable_function_log_buffer_size: Option<usize>,

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