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diff --git a/fluent-bit/plugins/out_prometheus_exporter/prom.h b/fluent-bit/plugins/out_prometheus_exporter/prom.h
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+++ b/fluent-bit/plugins/out_prometheus_exporter/prom.h
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+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2022 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_PROMETHEUS_EXPORTER_H
+#define FLB_PROMETHEUS_EXPORTER_H
+
+#include <fluent-bit/flb_output_plugin.h>
+#include <fluent-bit/flb_hash_table.h>
+
+/* Plugin context */
+struct prom_exporter {
+    void *http;
+
+    /* hash table for metrics reported */
+    struct flb_hash_table *ht_metrics;
+
+    /* add timestamp to every metric */
+    int add_timestamp;
+
+    /* config reader for 'add_label' */
+    struct mk_list *add_labels;
+
+    /* internal labels ready to append */
+    struct mk_list kv_labels;
+
+    /* instance context */
+    struct flb_output_instance *ins;
+};
+
+#endif