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annotate mod_prometheus/mod_prometheus.lua @ 4578:d95fcde6e39d

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mod_measure_lua: add openmetrics-spirited way to collect lua memory use In the spirit of separate collectors found in other Prometheus packages, this is a separate module to collect metrics related to the lua stack itself.
author Jonas Schäfer <jonas@wielicki.name>
date Sat, 29 May 2021 12:12:17 +0200
parents 1e70538e4641
children bac3dae031ee
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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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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";
3125
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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