feat(haproxy): add initial implementation for HAProxy log ingestion

rust/haproxy_ingest_proto/proto/haproxy_ingest.proto

@@ -0,0 +1,71 @@
+syntax = "proto3";
+
+package haproxy.ingest.v1;
+
+message LogBatch {
+  uint32 schema_version = 1;
+  string machine_id = 2;
+  string hostname = 3;
+  optional string previous_cursor = 4;
+  string last_cursor = 5;
+  int64 first_journal_timestamp_us = 6;
+  int64 last_journal_timestamp_us = 7;
+  repeated LogRecord records = 8;
+}
+
+message LogRecord {
+  int64 journal_timestamp_us = 1;
+
+  oneof payload {
+    HAProxyEvent event = 2;
+    RejectedEvent rejected = 3;
+    JournalGap gap = 4;
+  }
+}
+
+message HAProxyEvent {
+  reserved 22;
+
+  optional string client_ip = 1;
+  optional uint32 client_port = 2;
+  optional string frontend_name = 3;
+  optional string backend_name = 4;
+  optional string server_name = 5;
+  optional string http_method = 6;
+  optional string request_path = 7;
+  optional string http_version = 8;
+  int32 status_code = 9;
+  uint64 bytes_sent = 10;
+  int32 time_request_ms = 11;
+  int32 time_wait_ms = 12;
+  int32 time_connect_ms = 13;
+  int32 time_response_ms = 14;
+  int32 time_total_ms = 15;
+  optional string termination_state = 16;
+  uint32 retries = 17;
+  optional string tls_sni = 18;
+  optional string tls_version = 19;
+  optional string tls_cipher = 20;
+  optional bool tls_resumed = 21;
+  repeated string normalization_flags = 23;
+  optional uint32 active_connections = 24;
+  optional uint32 frontend_connections = 25;
+  optional uint32 backend_connections = 26;
+  optional uint32 server_connections = 27;
+  optional uint32 server_queue = 28;
+  optional uint32 backend_queue = 29;
+}
+
+message RejectedEvent {
+  string reason = 1;
+  bytes message_sha256 = 2;
+  optional string raw_message_prefix = 3;
+  bool raw_message_truncated = 4;
+}
+
+message JournalGap {
+  string expected_cursor = 1;
+  string first_available_cursor = 2;
+  optional int64 first_available_timestamp_us = 3;
+  string reason = 4;
+}