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diff --git a/fluent-bit/plugins/out_chronicle/chronicle.h b/fluent-bit/plugins/out_chronicle/chronicle.h
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+++ b/fluent-bit/plugins/out_chronicle/chronicle.h
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+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2023 The Fluent Bit Authors
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#ifndef FLB_OUT_CHRONICLE
+#define FLB_OUT_CHRONICLE
+
+#include <fluent-bit/flb_info.h>
+#include <fluent-bit/flb_output.h>
+#include <fluent-bit/flb_oauth2.h>
+#include <fluent-bit/flb_sds.h>
+
+/* refresh token every 50 minutes */
+#define FLB_CHRONICLE_TOKEN_REFRESH 3000
+
+/* Timestamp format */
+#define FLB_STD_TIME_FMT  "%Y-%m-%dT%H:%M:%S"
+
+/* Chronicle unstructureed logs oauth scope */
+#define FLB_CHRONICLE_SCOPE     "https://www.googleapis.com/auth/malachite-ingestion"
+
+/* Chronicle authorization URL */
+#define FLB_CHRONICLE_AUTH_URL  "https://oauth2.googleapis.com/token"
+
+#define FLB_CHRONICLE_UNSTRUCTURED_ENDPOINT "/v2/unstructuredlogentries:batchCreate"
+#define FLB_CHRONICLE_LOG_TYPE_ENDPOINT     "/v2/logtypes"
+#define FLB_CHRONICLE_URL_BASE              "https://malachiteingestion-pa.googleapis.com"
+#define FLB_CHRONICLE_URL_BASE_EU           "https://europe-malachiteingestion-pa.googleapis.com"
+#define FLB_CHRONICLE_URL_BASE_UK           "https://europe-west2-malachiteingestion-pa.googleapis.com"
+#define FLB_CHRONICLE_URL_BASE_ASIA         "https://asia-southeast1-malachiteingestion-pa.googleapis.com"
+
+struct flb_chronicle_oauth_credentials {
+    /* parsed credentials file */
+    flb_sds_t type;
+    flb_sds_t project_id;
+    flb_sds_t private_key_id;
+    flb_sds_t private_key;
+    flb_sds_t client_email;
+    flb_sds_t client_id;
+    flb_sds_t auth_uri;
+    flb_sds_t token_uri;
+};
+
+struct flb_chronicle {
+    /* credentials */
+    flb_sds_t credentials_file;
+
+    struct flb_chronicle_oauth_credentials *oauth_credentials;
+
+    /* chronicle configuration */
+    flb_sds_t project_id;
+    flb_sds_t customer_id;
+    flb_sds_t log_type;
+
+    flb_sds_t uri;
+    flb_sds_t health_uri;
+    flb_sds_t endpoint;
+    flb_sds_t region;
+    flb_sds_t log_key;
+
+    int json_date_format;
+    flb_sds_t json_date_key;
+    flb_sds_t date_key;
+
+    /* oauth2 context */
+    struct flb_oauth2 *o;
+
+    /* mutex for acquiring oauth tokens */
+    pthread_mutex_t token_mutex;
+
+    /* Upstream connection to the backend server */
+    struct flb_upstream *u;
+
+    /* Fluent Bit context */
+    struct flb_config *config;
+
+    /* Plugin output instance reference */
+    struct flb_output_instance *ins;
+};
+
+#endif