in_process_exporter_metrics: implement process exporter metrics

CMakeLists.txt

@@ -209,6 +209,7 @@ option(FLB_IN_OPENTELEMETRY            "Enable OpenTelemetry input plugin"
 option(FLB_IN_ELASTICSEARCH            "Enable Elasticsearch (Bulk API) input plugin" Yes)
 option(FLB_IN_CALYPTIA_FLEET           "Enable Calyptia Fleet input plugin"           Yes)
 option(FLB_IN_SPLUNK                   "Enable Splunk HTTP HEC input plugin"          Yes)
+option(FLB_IN_PROCESS_EXPORTER_METRICS "Enable process exporter metrics input plugin" Yes)
 option(FLB_OUT_AZURE                   "Enable Azure output plugin"                   Yes)
 option(FLB_OUT_AZURE_BLOB              "Enable Azure output plugin"                   Yes)
 option(FLB_OUT_AZURE_LOGS_INGESTION    "Enable Azure Logs Ingestion output plugin"    Yes)

plugins/CMakeLists.txt

@@ -206,6 +206,7 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
   REGISTER_IN_PLUGIN("in_docker")
   REGISTER_IN_PLUGIN("in_docker_events")
   REGISTER_IN_PLUGIN("in_podman_metrics")
+  REGISTER_IN_PLUGIN("in_process_exporter_metrics")
 endif()
 
 if(${CMAKE_SYSTEM_NAME} MATCHES "Linux" OR ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")

plugins/in_process_exporter_metrics/CMakeLists.txt

@@ -0,0 +1,8 @@
+set(src
+  pe.c
+  pe_config.c
+  pe_process.c
+  pe_utils.c
+  )
+
+FLB_PLUGIN(in_process_exporter_metrics "${src}" "")

plugins/in_process_exporter_metrics/pe.c

@@ -0,0 +1,174 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 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.
+ */
+
+#include <fluent-bit/flb_input_plugin.h>
+#include <fluent-bit/flb_config.h>
+#include <fluent-bit/flb_config_map.h>
+#include <fluent-bit/flb_error.h>
+#include <fluent-bit/flb_pack.h>
+
+#include "pe.h"
+#include "pe_config.h"
+
+#include "pe_process.h"
+
+static void update_metrics(struct flb_input_instance *ins, struct flb_pe *ctx)
+{
+    pe_process_update(ctx);
+}
+
+/*
+ * Update the metrics, this function is invoked every time 'scrape_interval'
+ * expires.
+ */
+static int cb_pe_collect(struct flb_input_instance *ins,
+                         struct flb_config *config, void *in_context)
+{
+    int ret;
+    struct flb_pe *ctx = in_context;
+
+    update_metrics(ins, ctx);
+
+    /* Append the updated metrics */
+    ret = flb_input_metrics_append(ins, NULL, 0, ctx->cmt);
+    if (ret != 0) {
+        flb_plg_error(ins, "could not append metrics");
+    }
+
+    return 0;
+}
+
+static int in_pe_init(struct flb_input_instance *in,
+                      struct flb_config *config, void *data)
+{
+    int ret;
+    struct flb_pe *ctx;
+
+    /* Create plugin context */
+    ctx = flb_pe_config_create(in, config);
+    if (!ctx) {
+        flb_errno();
+        return -1;
+    }
+
+    /* Initialize fds */
+    ctx->coll_fd = -1;
+
+    /* Associate context with the instance */
+    flb_input_set_context(in, ctx);
+
+    /* Create the collector */
+    ret = flb_input_set_collector_time(in,
+                                       cb_pe_collect,
+                                       ctx->scrape_interval, 0,
+                                       config);
+    if (ret == -1) {
+        flb_plg_error(ctx->ins,
+                      "could not set collector for Node Exporter Metrics plugin");
+        return -1;
+    }
+    ctx->coll_fd = ret;
+
+    /* Initialize process metric collectors */
+    pe_process_init(ctx);
+
+    update_metrics(in, ctx);
+
+    return 0;
+}
+
+static int in_pe_exit(void *data, struct flb_config *config)
+{
+    struct flb_pe *ctx = data;
+
+    if (!ctx) {
+        return 0;
+    }
+
+    pe_process_exit(ctx);
+
+    flb_pe_config_destroy(ctx);
+
+    return 0;
+}
+
+static void in_pe_pause(void *data, struct flb_config *config)
+{
+    struct flb_pe *ctx = data;
+
+    flb_input_collector_pause(ctx->coll_fd, ctx->ins);
+}
+
+static void in_pe_resume(void *data, struct flb_config *config)
+{
+    struct flb_pe *ctx = data;
+
+    flb_input_collector_resume(ctx->coll_fd, ctx->ins);
+}
+
+/* Configuration properties map */
+static struct flb_config_map config_map[] = {
+    {
+     FLB_CONFIG_MAP_TIME, "scrape_interval", "5",
+     0, FLB_TRUE, offsetof(struct flb_pe, scrape_interval),
+     "scrape interval to collect metrics from the node."
+    },
+
+    {
+     FLB_CONFIG_MAP_STR, "path.procfs", "/proc",
+     0, FLB_TRUE, offsetof(struct flb_pe, path_procfs),
+     "procfs mount point"
+    },
+
+    {
+     FLB_CONFIG_MAP_STR, "process_include_pattern",  ".+",
+     0, FLB_TRUE, offsetof(struct flb_pe, process_regex_include_list_text),
+     "include list regular expression"
+    },
+
+    {
+     FLB_CONFIG_MAP_STR, "process_exclude_pattern", NULL,
+     0, FLB_TRUE, offsetof(struct flb_pe, process_regex_exclude_list_text),
+     "exclude list regular expression"
+    },
+
+    {
+     FLB_CONFIG_MAP_CLIST, "metrics",
+     PE_DEFAULT_ENABLED_METRICS,
+     0, FLB_TRUE, offsetof(struct flb_pe, metrics),
+     "Comma separated list of keys to enable metrics."
+    },
+
+    /* EOF */
+    {0}
+};
+
+struct flb_input_plugin in_process_exporter_metrics_plugin = {
+    .name         = "process_exporter_metrics",
+    .description  = "Process Exporter Metrics (Prometheus Compatible)",
+    .cb_init      = in_pe_init,
+    .cb_pre_run   = NULL,
+    .cb_collect   = cb_pe_collect,
+    .cb_flush_buf = NULL,
+    .config_map   = config_map,
+    .cb_pause     = in_pe_pause,
+    .cb_resume    = in_pe_resume,
+    .cb_exit      = in_pe_exit,
+    .flags        = FLB_INPUT_THREADED
+};

plugins/in_process_exporter_metrics/pe.h

@@ -0,0 +1,89 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 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_PROCESS_EXPORTER_H
+#define FLB_PROCESS_EXPORTER_H
+
+/* utils: scan content type expected */
+#define NE_SCAN_FILE      1
+#define NE_SCAN_DIR       2
+
+#include <fluent-bit/flb_info.h>
+#include <fluent-bit/flb_input_plugin.h>
+#include <fluent-bit/flb_regex.h>
+#include <fluent-bit/flb_hash_table.h>
+#include <fluent-bit/flb_metrics.h>
+
+#define PE_DEFAULT_ENABLED_METRICS "cpu,io,memory,state,context_switches,fd,start_time,thread_wchan,thread"
+
+#define METRIC_CPU          (1 << 0)
+#define METRIC_IO           (1 << 1)
+#define METRIC_MEMORY       (1 << 2)
+#define METRIC_STATE        (1 << 3)
+#define METRIC_CTXT         (1 << 4)
+#define METRIC_FD           (1 << 5)
+#define METRIC_START_TIME   (1 << 6)
+#define METRIC_THREAD_WCHAN (1 << 7)
+#define METRIC_THREAD       (1 << 8)
+
+struct flb_pe {
+    /* configuration */
+    flb_sds_t path_procfs;
+    int scrape_interval;
+
+    int coll_fd;                    /* collector fd     */
+    struct cmt *cmt;                /* cmetrics context */
+    struct flb_input_instance *ins; /* input instance   */
+    struct mk_list *metrics;        /* enabled metrics */
+    int enabled_flag;               /* indicate enabled metrics */
+
+    /*
+     * Metrics Contexts
+     * ----------------
+     */
+
+    /* process */
+    struct cmt_gauge *memory_bytes;
+    struct cmt_gauge *start_time;
+    struct cmt_gauge *open_fds;
+    struct cmt_gauge *fd_ratio;
+    struct cmt_counter *cpu_seconds;
+    struct cmt_counter *read_bytes;
+    struct cmt_counter *write_bytes;
+    struct cmt_counter *major_page_faults;
+    struct cmt_counter *minor_page_faults;
+    struct cmt_counter *context_switches;
+    struct cmt_gauge *num_threads;
+    struct cmt_gauge *states;
+
+    /* thread */
+    struct cmt_gauge *thread_wchan;
+    struct cmt_counter *thread_cpu_seconds;
+    struct cmt_counter *thread_io_bytes;
+    struct cmt_counter *thread_major_page_faults;
+    struct cmt_counter *thread_minor_page_faults;
+    struct cmt_counter *thread_context_switches;
+
+    flb_sds_t           process_regex_include_list_text;
+    flb_sds_t           process_regex_exclude_list_text;
+    struct flb_regex   *process_regex_include_list;
+    struct flb_regex   *process_regex_exclude_list;
+};
+
+#endif