Mercurial > prosody-modules
annotate mod_prometheus/mod_prometheus.lua @ 4625:f7e26c43a9bc
mod_pubsub_alertmanager: Add TODOs
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 16 Jul 2021 17:35:28 +0200 |
parents | c406e4bf7ee5 |
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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 |
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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 |
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201 end |
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202 |
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203 function module.add_host(module) |
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204 module:depends "http"; |
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205 module:provides("http", { |
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206 default_path = "metrics"; |
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207 route = { |
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208 GET = get_metrics; |
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209 }; |
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210 }); |
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211 end |