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annotate mod_prometheus/mod_prometheus.lua @ 5551:8bfcedd93a72

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mod_rest: List all error conditions in OpenAPI spec These are not handled by datamanager but by util.stanza and util.error, so they are not represented in the JSON schema file.
author Kim Alvefur <zash@zash.se>
date Sat, 17 Jun 2023 16:26:33 +0200
parents c406e4bf7ee5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Log statistics to Prometheus
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2 --
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3 -- Copyright (C) 2014 Daurnimator
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4 -- Copyright (C) 2018 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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5 -- Copyright (C) 2021 Jonas Schäfer <jonas@zombofant.net>
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6 --
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7 -- This module is MIT/X11 licensed.
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8
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9 module:set_global();
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10
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11 local tostring = tostring;
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12 local t_insert = table.insert;
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13 local t_concat = table.concat;
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14 local socket = require "socket";
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15 local statsman = require "core.statsmanager";
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16 local get_stats = statsman.get_stats;
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17 local get_metric_registry = statsman.get_metric_registry;
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18 local collect = statsman.collect;
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19
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20 local function escape(text)
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21 return text:gsub("\\", "\\\\"):gsub("\"", "\\\""):gsub("\n", "\\n");
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22 end
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23
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24 local function escape_name(name)
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25 return name:gsub("/", "__"):gsub("[^A-Za-z0-9_]", "_"):gsub("^[^A-Za-z_]", "_%1");
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26 end
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27
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28 local function get_timestamp()
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29 -- Using LuaSocket for that because os.time() only has second precision.
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30 return math.floor(socket.gettime() * 1000);
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31 end
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32
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33 local function repr_help(metric, docstring)
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34 docstring = docstring:gsub("\\", "\\\\"):gsub("\n", "\\n");
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35 return "# HELP "..escape_name(metric).." "..docstring.."\n";
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36 end
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37
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38 local function repr_unit(metric, unit)
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39 if not unit then
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40 unit = ""
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41 else
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42 unit = unit:gsub("\\", "\\\\"):gsub("\n", "\\n");
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43 end
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44 return "# UNIT "..escape_name(metric).." "..unit.."\n";
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45 end
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46
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47 -- local allowed_types = { counter = true, gauge = true, histogram = true, summary = true, untyped = true };
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48 -- local allowed_types = { "counter", "gauge", "histogram", "summary", "untyped" };
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49 local function repr_type(metric, type_)
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50 -- if not allowed_types:contains(type_) then
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51 -- return;
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52 -- end
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53 return "# TYPE "..escape_name(metric).." "..type_.."\n";
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54 end
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55
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56 local function repr_label(key, value)
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57 return key.."=\""..escape(value).."\"";
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58 end
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59
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60 local function repr_labels(labelkeys, labelvalues, extra_labels)
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61 local values = {}
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62 if labelkeys then
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63 for i, key in ipairs(labelkeys) do
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64 local value = labelvalues[i]
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65 t_insert(values, repr_label(escape_name(key), escape(value)));
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66 end
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67 end
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68 if extra_labels then
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69 for key, value in pairs(extra_labels) do
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70 t_insert(values, repr_label(escape_name(key), escape(value)));
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71 end
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72 end
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73 if #values == 0 then
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74 return "";
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75 end
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76 return "{"..t_concat(values, ",").."}";
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77 end
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78
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79 local function repr_sample(metric, labelkeys, labelvalues, extra_labels, value)
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80 return escape_name(metric)..repr_labels(labelkeys, labelvalues, extra_labels).." "..string.format("%.17g", value).."\n";
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81 end
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82
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83 local get_metrics;
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84 if statsman.get_metric_registry then
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85 module:log("debug", "detected OpenMetrics statsmanager")
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86 -- Prosody 0.12+ with OpenMetrics
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87 function get_metrics(event)
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88 local response = event.response;
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89 response.headers.content_type = "application/openmetrics-text; version=0.0.4";
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90
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91 if collect then
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92 -- Ensure to get up-to-date samples when running in manual mode
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93 collect()
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94 end
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95
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96 local registry = get_metric_registry()
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97 if registry == nil then
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98 response.headers.content_type = "text/plain; charset=utf-8"
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99 response.status_code = 404
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100 return "No statistics provider configured\n"
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101 end
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102 local answer = {};
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103 for metric_family_name, metric_family in pairs(registry:get_metric_families()) do
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104 t_insert(answer, repr_help(metric_family_name, metric_family.description))
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105 t_insert(answer, repr_unit(metric_family_name, metric_family.unit))
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106 t_insert(answer, repr_type(metric_family_name, metric_family.type_))
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107 for labelset, metric in metric_family:iter_metrics() do
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108 for suffix, extra_labels, value in metric:iter_samples() do
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109 t_insert(answer, repr_sample(metric_family_name..suffix, metric_family.label_keys, labelset, extra_labels, value))
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110 end
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111 end
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112 end
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113 t_insert(answer, "# EOF\n")
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114 return t_concat(answer, "");
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115 end
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116 else
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117 module:log("debug", "detected pre-OpenMetrics statsmanager")
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118 -- Pre-OpenMetrics
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119
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120 local allowed_extras = { min = true, max = true, average = true };
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121 local function insert_extras(data, key, name, timestamp, extra)
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122 if not extra then
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123 return false;
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124 end
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125 local has_extra = false;
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126 for extra_name in pairs(allowed_extras) do
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127 if extra[extra_name] then
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128 local field = {
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129 value = extra[extra_name],
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130 labels = {
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131 ["type"] = name,
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132 field = extra_name,
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133 },
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134 typ = "gauge";
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135 timestamp = timestamp,
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136 };
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137 t_insert(data[key], field);
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138 has_extra = true;
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139 end
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140 end
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141 return has_extra;
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142 end
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143
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144 local function parse_stats()
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145 local timestamp = tostring(get_timestamp());
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146 local data = {};
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147 local stats, changed_only, extras = get_stats();
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148 for stat, value in pairs(stats) do
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149 -- module:log("debug", "changed_stats[%q] = %s", stat, tostring(value));
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150 local extra = extras[stat];
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151 local host, sect, name, typ = stat:match("^/([^/]+)/([^/]+)/(.+):(%a+)$");
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152 if host == nil then
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153 sect, name, typ = stat:match("^([^.]+)%.(.+):(%a+)$");
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154 elseif host == "*" then
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155 host = nil;
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156 end
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157 if sect:find("^mod_measure_.") then
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158 sect = sect:sub(13);
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159 elseif sect:find("^mod_statistics_.") then
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160 sect = sect:sub(16);
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161 end
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162
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163 local key = escape_name("prosody_"..sect);
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164 local field = {
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165 value = value,
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166 labels = { ["type"] = name},
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167 -- TODO: Use the other types where it makes sense.
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168 typ = (typ == "rate" and "counter" or "gauge"),
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169 timestamp = timestamp,
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170 };
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171 if host then
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172 field.labels.host = host;
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173 end
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174 if data[key] == nil then
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175 data[key] = {};
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176 end
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177 if not insert_extras(data, key, name, timestamp, extra) then
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178 t_insert(data[key], field);
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179 end
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180 end
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181 return data;
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182 end
4555
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183
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184 function get_metrics(event)
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185 local response = event.response;
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186 response.headers.content_type = "text/plain; version=0.0.4";
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187 if statsman.collect then
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188 statsman.collect()
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189 end
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190
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191 local answer = {};
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192 for key, fields in pairs(parse_stats()) do
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193 t_insert(answer, repr_help(key, ""));
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194 t_insert(answer, repr_type(key, fields[1].typ));
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195 for _, field in pairs(fields) do
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196 t_insert(answer, repr_sample(key, nil, nil, field.labels, field.value, field.timestamp));
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197 end
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198 end
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199 return t_concat(answer, "");
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200 end
3125
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201 end
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parents:
diff changeset
202
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parents:
diff changeset
203 function module.add_host(module)
3952
343dc9dd70dd mod_prometheus: Ensure mod_http is loaded where the http interface is exposed (thanks Martin)
Kim Alvefur <zash@zash.se>
parents: 3149
diff changeset
204 module:depends "http";
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diff changeset
205 module:provides("http", {
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diff changeset
206 default_path = "metrics";
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diff changeset
207 route = {
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diff changeset
208 GET = get_metrics;
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diff changeset
209 };
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diff changeset
210 });
07a2ba55de4d mod_prometheus: Add a new statistics export module, for Prometheus.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
211 end