Mercurial > prosody-modules
annotate mod_log_json/README.markdown @ 4877:adc6241e5d16
mod_measure_process: Report the enforced limit
The soft limit is what the kernel actually enforces, while the hard
limit is is how far you can change the soft limit without privileges.
Unless the process dynamically adjusts the soft limit, knowing the hard
limit is not as useful as knowing the soft limit.
Reporting the soft limit and the number of in-use FDs allows placing
alerts on expressions like 'process_open_fds / process_max_fds >= 0.95'
| author | Kim Alvefur <zash@zash.se> |
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| date | Tue, 18 Jan 2022 18:55:20 +0100 |
| parents | 4356088ad675 |
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| rev | line source |
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| 3735 | 1 --- |
| 2 summary: JSON Log Sink | |
| 3 --- | |
| 4 | |
| 5 Conifiguration | |
| 6 ============== | |
| 7 | |
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8 Here we log to `/var/log/prosody/prosody.json`: |
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9 |
| 3735 | 10 ``` {.lua} |
| 11 log = { | |
| 12 -- your other log sinks | |
| 13 info = "/var/log/prosody/prosody.log" | |
| 14 -- add this: | |
| 15 { to = "json", filename = "/var/log/prosody/prosody.json" }; | |
| 16 } | |
| 17 ``` | |
| 18 | |
| 3746 | 19 ## UDP |
| 20 | |
| 21 Alternatively, it can send logs via UDP: | |
| 22 | |
| 23 ```lua | |
| 24 log = { | |
| 25 { to = "json", udp_host = "10.1.2.3", udp_port = "9999" }; | |
| 26 } | |
| 27 ``` | |
| 28 | |
| 3735 | 29 Format |
| 30 ====== | |
| 31 | |
| 32 JSON log files consist of a series of `\n`-separated JSON objects, | |
| 33 suitable for mangling with tools like | |
| 34 [`jq`](https://stedolan.github.io/jq/). | |
| 35 | |
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36 Example (with whitespace and indentation for readability): |
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37 |
| 3735 | 38 ``` {.json} |
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39 { |
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40 "args" : [], |
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41 "datetime" : "2019-11-03T13:38:28Z", |
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42 "level" : "info", |
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43 "message" : "Client connected", |
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44 "source" : "c2s55f267f5b9d0" |
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45 } |
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46 { |
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47 "args" : [ |
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48 "user@example.net" |
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49 ], |
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50 "datetime" : "2019-11-03T13:38:28Z", |
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51 "level" : "debug", |
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52 "message" : "load_roster: asked for: %s", |
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53 "source" : "rostermanager" |
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54 } |
| 3735 | 55 ``` |
| 56 | |
| 57 `datetime` | |
| 58 : [XEP-0082]-formatted timestamp. | |
| 59 | |
| 60 `source` | |
| 61 : Log source, usually a module or a connected session. | |
| 62 | |
| 63 `level` | |
| 64 : `debug`, `info`, `warn` or `error` | |
| 65 | |
| 66 `message` | |
| 67 : The log message in `printf` format. Combine with `args` to get the | |
| 68 final message. | |
| 69 | |
| 70 `args` | |
| 71 : Array of extra arguments, corresponding to `printf`-style `%s` | |
| 72 formatting in the `message`. | |
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73 |
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74 Formatted message |
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75 ----------------- |
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76 |
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77 If desired, at the obvious expense of performance, the formatted version of |
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78 the string can be included in the JSON object by specifying the `formatted_as` |
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79 key in the logger config: |
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80 |
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81 ``` {.lua} |
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82 log = { |
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83 -- ... other sinks ... |
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84 { to = "json", formatted_as = "msg_formatted", filename = "/var/log/prosody/prosody.json" }; |
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85 } |
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86 |
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87 ``` |
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88 |
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89 This will expose the formatted message in the JSON as separate `msg_formatted` |
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90 key. It is possible to override existing keys using this (for example, the |
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91 `message` key), but not advisible. |