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annotate mod_prometheus/mod_prometheus.lua @ 4203:c4002aae4ad3

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mod_s2s_keepalive: Use timestamp as iq @id RFC 6120 implies that the id attribute must be unique within a stream. This should fix problems with remote servers that enforce uniqueness and don't answer duplicated ids. If it doesn't do that, then at least you can get a guesstimate at round-trip time from the difference between the result iq stanza and the timestamp it was logged without having to go look for when it was sent, or needing to keep state.
author Kim Alvefur <zash@zash.se>
date Wed, 14 Oct 2020 18:02:10 +0200
parents 343dc9dd70dd
children fb4a50bf60f1
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 --
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6 -- This module is MIT/X11 licensed.
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7
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8 module:set_global();
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9
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10 local tostring = tostring;
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11 local t_insert = table.insert;
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12 local t_concat = table.concat;
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13 local socket = require "socket";
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14 local get_stats = require "core.statsmanager".get_stats;
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15
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16 local function escape(text)
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17 return text:gsub("\\", "\\\\"):gsub("\"", "\\\""):gsub("\n", "\\n");
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18 end
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19
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20 local function escape_name(name)
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21 return name:gsub("[^A-Za-z0-9_]", "_"):gsub("^[^A-Za-z_]", "_%1");
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22 end
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23
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24 local function get_timestamp()
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25 -- Using LuaSocket for that because os.time() only has second precision.
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26 return math.floor(socket.gettime() * 1000);
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27 end
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28
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29 local function repr_help(metric, docstring)
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30 docstring = docstring:gsub("\\", "\\\\"):gsub("\n", "\\n");
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31 return "# HELP "..escape_name(metric).." "..docstring.."\n";
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32 end
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33
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34 -- local allowed_types = { counter = true, gauge = true, histogram = true, summary = true, untyped = true };
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35 -- local allowed_types = { "counter", "gauge", "histogram", "summary", "untyped" };
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36 local function repr_type(metric, type_)
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37 -- if not allowed_types:contains(type_) then
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38 -- return;
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39 -- end
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40 return "# TYPE "..escape_name(metric).." "..type_.."\n";
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41 end
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42
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43 local function repr_label(key, value)
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44 return key.."=\""..escape(value).."\"";
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45 end
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46
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47 local function repr_labels(labels)
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48 local values = {}
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49 for key, value in pairs(labels) do
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50 t_insert(values, repr_label(escape_name(key), escape(value)));
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51 end
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52 if #values == 0 then
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53 return "";
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54 end
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55 return "{"..t_concat(values, ", ").."}";
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56 end
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57
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58 local function repr_sample(metric, labels, value, timestamp)
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59 return escape_name(metric)..repr_labels(labels).." "..value.." "..timestamp.."\n";
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60 end
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61
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62 local allowed_extras = { min = true, max = true, average = true };
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63 local function insert_extras(data, key, name, timestamp, extra)
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64 if not extra then
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65 return false;
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66 end
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67 local has_extra = false;
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68 for extra_name in pairs(allowed_extras) do
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69 if extra[extra_name] then
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70 local field = {
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71 value = extra[extra_name],
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72 labels = {
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73 ["type"] = name,
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74 field = extra_name,
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75 },
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76 typ = "gauge";
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77 timestamp = timestamp,
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78 };
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79 t_insert(data[key], field);
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80 has_extra = true;
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81 end
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82 end
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83 return has_extra;
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84 end
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85
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86 local function parse_stats()
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87 local timestamp = tostring(get_timestamp());
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88 local data = {};
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89 local stats, changed_only, extras = get_stats();
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90 for stat, value in pairs(stats) do
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91 -- module:log("debug", "changed_stats[%q] = %s", stat, tostring(value));
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92 local extra = extras[stat];
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93 local host, sect, name, typ = stat:match("^/([^/]+)/([^/]+)/(.+):(%a+)$");
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94 if host == nil then
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95 sect, name, typ = stat:match("^([^.]+)%.(.+):(%a+)$");
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96 elseif host == "*" then
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97 host = nil;
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98 end
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99 if sect:find("^mod_measure_.") then
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100 sect = sect:sub(13);
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101 elseif sect:find("^mod_statistics_.") then
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102 sect = sect:sub(16);
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103 end
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104
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105 local key = escape_name("prosody_"..sect);
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106 local field = {
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107 value = value,
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108 labels = { ["type"] = name},
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109 -- TODO: Use the other types where it makes sense.
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110 typ = (typ == "rate" and "counter" or "gauge"),
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111 timestamp = timestamp,
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112 };
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113 if host then
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114 field.labels.host = host;
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115 end
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116 if data[key] == nil then
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117 data[key] = {};
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118 end
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119 if not insert_extras(data, key, name, timestamp, extra) then
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120 t_insert(data[key], field);
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121 end
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122 end
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123 return data;
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124 end
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125
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126 local function get_metrics(event)
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127 local response = event.response;
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128 response.headers.content_type = "text/plain; version=0.0.4";
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129
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130 local answer = {};
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131 for key, fields in pairs(parse_stats()) do
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132 t_insert(answer, repr_help(key, "TODO: add a description here."));
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133 t_insert(answer, repr_type(key, fields[1].typ));
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134 for _, field in pairs(fields) do
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135 t_insert(answer, repr_sample(key, field.labels, field.value, field.timestamp));
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136 end
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137 end
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138 return t_concat(answer, "");
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139 end
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140
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141 function module.add_host(module)
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142 module:depends "http";
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143 module:provides("http", {
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144 default_path = "metrics";
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145 route = {
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146 GET = get_metrics;
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147 };
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148 });
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149 end