Add ability to tune per-log batching behavior

crates/ct_worker/config.schema.json

@@ -77,7 +77,12 @@
                         "max_sequence_skips": {
                             "type": "integer",
                             "default": 0,
-                            "description": "The maximum number of times sequencing can be skipped to avoid creating partial tiles. If non-zero, pending entries may be delayed by a multiple of the sequence interval."
+                            "description": "The maximum number of times sequencing can be skipped to avoid creating partial tiles. If non-zero, pending entries may be delayed by either a multiple of the sequence interval or sequence_skip_threshold_millis if set."
+                        },
+                        "sequence_skip_threshold_millis": {
+                            "type": "integer",
+                            "default": 0,
+                            "description": "If non-zero, entries will only be skipped by sequencing (when max_sequenced_skips is non-zero) if they have been in the pool for less than this timeout."
                         },
                         "num_batchers": {
                             "type": "integer",
@@ -90,7 +95,7 @@
                             "type": "integer",
                             "minimum": 100,
                             "default": 1000,
-                            "description": "The maximum time to wait before submitting a batch to the sequencer, in milliseconds."
+                            "description": "The maximum duration to wait before submitting a batch to the sequencer, in milliseconds."
                         },
                         "max_batch_entries": {
                             "type": "integer",

crates/ct_worker/config/src/lib.rs

@@ -31,6 +31,7 @@ pub struct LogParams {
     pub sequence_interval_millis: u64,
     #[serde(default = "default_max_sequence_skips")]
     pub max_sequence_skips: usize,
+    pub sequence_skip_threshold_millis: Option<u64>,
     #[serde(default = "default_num_batchers")]
     pub num_batchers: u8,
     #[serde(default = "default_batch_timeout_millis")]