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annotate mod_measure_process/mod_measure_process.lua @ 4776:13e913471b75

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mod_http_admin_api: Ensure freshness of metrics when in manual mode When in manual collection mode, as recommended for Prometheus, collection needs to be triggered manually, or they would be stale, possibly dating from the start of the server. This might vary per metric depending on how and when the metrics are gathered.
author Kim Alvefur <zash@zash.se>
date Thu, 18 Nov 2021 19:26:07 +0100
parents 025cf93acfe9
children adc6241e5d16
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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025cf93acfe9 mod_measure_process: Provide metrics about the process itself
Jonas Schäfer <jonas@wielicki.name>
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1 module:set_global()
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2
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3 local get_cpu_time = os.clock
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4
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5 local custom_metric = require "core.statsmanager".metric
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6 local cpu_time = custom_metric(
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7 "counter", "process_cpu", "seconds",
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8 "CPU time used by Prosody as reported by clock(3)."
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9 ):with_labels()
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10
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11 local lfs = require "lfs"
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12
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13 module:hook("stats-update", function ()
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14 cpu_time:set(get_cpu_time())
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15 end);
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16
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17 if lfs.attributes("/proc/self/statm", "mode") == "file" then
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18 local pagesize = module:get_option_number("memory_pagesize", 4096); -- getconf PAGESIZE
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19
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20 local vsz = custom_metric(
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21 "gauge", "process_virtual_memory", "bytes",
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22 "Virtual memory size in bytes."
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23 ):with_labels()
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24 local rss = custom_metric(
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25 "gauge", "process_resident_memory", "bytes",
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26 "Resident memory size in bytes."
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27 ):with_labels()
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28
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29 module:hook("stats-update", function ()
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30 local statm, err = io.open("/proc/self/statm");
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31 if not statm then
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32 module:log("error", tostring(err));
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33 return;
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34 end
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35 -- virtual memory (caches, opened librarys, everything)
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36 vsz:set(statm:read("*n") * pagesize);
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37 -- resident set size (actually used memory)
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38 rss:set(statm:read("*n") * pagesize);
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39 statm:close();
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40 end);
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41 end
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42
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43 if lfs.attributes("/proc/self/fd", "mode") == "directory" then
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44 local open_fds = custom_metric(
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45 "gauge", "process_open_fds", "",
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46 "Number of open file descriptors."
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47 ):with_labels()
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48
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49 local has_posix, posix = pcall(require, "util.pposix")
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50 local max_fds
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51 if has_posix then
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52 max_fds = custom_metric(
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53 "gauge", "process_max_fds", "",
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54 "Maximum number of open file descriptors"
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55 ):with_labels()
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56 else
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57 module:log("warn", "not reporting maximum number of file descriptors because mod_posix is not available")
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58 end
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59
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60 module:hook("stats-update", function ()
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61 local count = 0
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62 for _ in lfs.dir("/proc/self/fd") do
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63 count = count + 1
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64 end
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65 open_fds:set(count)
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66
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67 if has_posix then
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68 local ok, soft, hard = posix.getrlimit("NOFILE")
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69 if ok then
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70 max_fds:set(hard)
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71 end
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72 end
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73 end);
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74 end