fluent-bit metrics: add more metrics descriptions

also implemented flb_sds_cat_auto so that we don't need to manually counting the length of the string.

Enter [N/A] in the box, if an item is not applicable to your change.

Testing Before we can approve your change; please submit the following in a comment:

[x] Example configuration file for the change
[x] Debug log output from testing the change

[x] Attached Valgrind output that shows no leaks or memory corruption was found

Documentation

[N/A] Documentation required for this feature

Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Oct 16 '20 21:10 erain

Example configuration file for the change

Dummy configuration, mostly.

[SERVICE]
    Flush        1
    Daemon       Off
    Log_Level    debug

[INPUT]
    Name dummy

[OUTPUT]
    Name http
    Match *
    Host 127.0.0.1
    Port 8080
    Uri /post

Valgrind output that shows no leaks or memory corruption was found (with debug output)

==10572== Memcheck, a memory error detector
==10572== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==10572== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==10572== Command: ./bin/fluent-bit -c fluent-bit.config
==10572==
Fluent Bit v1.7.0
* Copyright (C) 2019-2020 The Fluent Bit Authors
* Copyright (C) 2015-2018 Treasure Data
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
* https://fluentbit.io

[2020/10/16 21:18:51] [ info] Configuration:
[2020/10/16 21:18:51] [ info]  flush time     | 1.000000 seconds
[2020/10/16 21:18:51] [ info]  grace          | 5 seconds
[2020/10/16 21:18:51] [ info]  daemon         | 0
[2020/10/16 21:18:51] [ info] ___________
[2020/10/16 21:18:51] [ info]  inputs:
[2020/10/16 21:18:51] [ info]      dummy
[2020/10/16 21:18:51] [ info] ___________
[2020/10/16 21:18:51] [ info]  filters:
[2020/10/16 21:18:51] [ info] ___________
[2020/10/16 21:18:51] [ info]  outputs:
[2020/10/16 21:18:51] [ info]      stackdriver.0
[2020/10/16 21:18:51] [ info]      http.1
[2020/10/16 21:18:51] [ info] ___________
[2020/10/16 21:18:51] [ info]  collectors:
[2020/10/16 21:18:51] [ info] [engine] started (pid=10572)
[2020/10/16 21:18:51] [debug] [engine] coroutine stack size: 24576 bytes (24.0K)
[2020/10/16 21:18:51] [debug] [storage] [cio stream] new stream registered: dummy.0
[2020/10/16 21:18:52] [ info] [storage] version=1.0.6, initializing...
[2020/10/16 21:18:52] [ info] [storage] in-memory
[2020/10/16 21:18:52] [ info] [storage] normal synchronization mode, checksum disabled, max_chunks_up=128
[2020/10/16 21:18:53] [debug] [output:stackdriver:stackdriver.0] JWT signature:
eyJhbGciOiAiUlMyNTYiLCAidHlwIjogIkpXVCJ9.eyJpc3MiOiAib255eC1vYnNlcnZhYmlsaXR5LXlpeXVAeWl5dS1na2UtZGV2LmlhbS5nc2VydmljZWFjY291bnQuY29tIiwgInNjb3BlIjogImh0dHBzOi8vd3d3Lmdvb2dsZWFwaXMuY29tL2F1dGgvbG9nZ2luZy53cml0ZSIsICJhdWQiOiAiaHR0cHM6Ly93d3cuZ29vZ2xlYXBpcy5jb20vb2F1dGgyL3Y0L3Rva2VuIiwgImV4cCI6IDE2MDI4ODYxMzIsICJpYXQiOiAxNjAyODgzMTMyfQ.IlVx5eLbXhzMqHvNWDqhSfP5O6mG0oIDiYJla4e_GrHVb4fTuTjuJ7Kz0brAfNzGO92p5YyX4jvEXcDx-jVPUpG4AveOTYsVK2ncPmKOJREkiaFtNtSE3I2B9-nG90GEs_vWqVwnd87xkHTiZ4tKnLNiC7HyBWyxJK_vQud1atwGtYxk2fTxALc2OHFiixkrOLq_hR8HdwfUqhhRakRwobqKBdxotqilMNHiceZlcr_wLEF39LBozQjNwAnANR0cRvlUCmdrlDQAI4Hys7AUZ60_Y-xw9Mi1pOHk0xwqIE-jGhAyxqymBN9H0sROtkqvKZ8iuELMlMGjKUh62ax14w
[2020/10/16 21:18:54] [ info] [oauth2] HTTP Status=200
[2020/10/16 21:18:54] [debug] [oauth2] payload:
{"access_token":"ya29.c.Ko8B4QdfdZgqrmAq5mzpl9EIxVN9YTuh0noHvug8kWx3z3HdZEBeALWLvM7wIpyi1qAslpOzif0l37Ofvx522Vq7OI2JZyAMC12XZt4rkrYKy88gQ2bCeSYBYwv6avtKSoS0ForIqVFoIHIiqSiJ__N0jRlbLbeCzAfO79arskmq0TLph9o-lMasvCxCDQydYgE","expires_in":3599,"token_type":"Bearer"}
[2020/10/16 21:18:54] [ info] [oauth2] access token from 'www.googleapis.com:443' retrieved
[2020/10/16 21:18:54] [debug] [router] match rule dummy.0:stackdriver.0
[2020/10/16 21:18:54] [debug] [router] match rule dummy.0:http.1
[2020/10/16 21:18:54] [ info] [sp] stream processor started
==10572== Warning: client switching stacks?  SP change: 0x6805948 --> 0x7d60330
==10572==          to suppress, use: --max-stackframe=22391272 or greater
==10572== Warning: client switching stacks?  SP change: 0x7d602a8 --> 0x6805948
==10572==          to suppress, use: --max-stackframe=22391136 or greater
==10572== Warning: client switching stacks?  SP change: 0x6805948 --> 0x7d602a8
==10572==          to suppress, use: --max-stackframe=22391136 or greater
==10572==          further instances of this message will not be shown.
[2020/10/16 21:18:55] [debug] [task] created task=0x7d59ea0 id=0 OK
[2020/10/16 21:18:56] [debug] [output:stackdriver:stackdriver.0] [logging.googleapis.com/monitored_resource] not found in the payload
[2020/10/16 21:18:56] [debug] [output:stackdriver:stackdriver.0] HTTP Status=200
[2020/10/16 21:18:56] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 is now available
[2020/10/16 21:18:56] [ info] [output:http:http.1] 127.0.0.1:8080, HTTP status=200
{
  "args": {},
  "data": "data:application/octet-stream;base64,ktcAX4oOPh5KdXeBp21lc3NhZ2WlZHVtbXk=",
  "files": {},
  "form": {},
  "headers": {
    "Content-Length": "26",
    "Content-Type": "application/msgpack",
    "Host": "127.0.0.1:8080",
    "User-Agent": "Fluent-Bit"
  },
  "json": null,
  "origin": "172.17.0.1",
  "url": "http://127.0.0.1:8080/post"
}

[2020/10/16 21:18:56] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 is now available
[2020/10/16 21:18:56] [debug] [task] destroy task=0x7d59ea0 (task_id=0)
[2020/10/16 21:18:56] [debug] [task] created task=0x81530f0 id=0 OK
[2020/10/16 21:18:56] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 has been assigned (recycled)
[2020/10/16 21:18:56] [debug] [output:stackdriver:stackdriver.0] [logging.googleapis.com/monitored_resource] not found in the payload
[2020/10/16 21:18:56] [debug] [output:stackdriver:stackdriver.0] HTTP Status=200
[2020/10/16 21:18:56] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 is now available
[2020/10/16 21:18:56] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 has been assigned (recycled)
[2020/10/16 21:18:56] [ info] [output:http:http.1] 127.0.0.1:8080, HTTP status=200
{
  "args": {},
  "data": "data:application/octet-stream;base64,ktcAX4oOQBkJvSuBp21lc3NhZ2WlZHVtbXk=",
  "files": {},
  "form": {},
  "headers": {
    "Content-Length": "26",
    "Content-Type": "application/msgpack",
    "Host": "127.0.0.1:8080",
    "User-Agent": "Fluent-Bit"
  },
  "json": null,
  "origin": "172.17.0.1",
  "url": "http://127.0.0.1:8080/post"
}

[2020/10/16 21:18:56] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 is now available
[2020/10/16 21:18:56] [debug] [task] destroy task=0x81530f0 (task_id=0)
[2020/10/16 21:18:57] [debug] [task] created task=0x81ba9c0 id=0 OK
[2020/10/16 21:18:57] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 has been assigned (recycled)
[2020/10/16 21:18:57] [debug] [output:stackdriver:stackdriver.0] [logging.googleapis.com/monitored_resource] not found in the payload
[2020/10/16 21:18:57] [debug] [output:stackdriver:stackdriver.0] HTTP Status=200
[2020/10/16 21:18:57] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 is now available
[2020/10/16 21:18:57] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 has been assigned (recycled)
[2020/10/16 21:18:57] [ info] [output:http:http.1] 127.0.0.1:8080, HTTP status=200
{
  "args": {},
  "data": "data:application/octet-stream;base64,ktcAX4oOQCJ/I6yBp21lc3NhZ2WlZHVtbXk=",
  "files": {},
  "form": {},
  "headers": {
    "Content-Length": "26",
    "Content-Type": "application/msgpack",
    "Host": "127.0.0.1:8080",
    "User-Agent": "Fluent-Bit"
  },
  "json": null,
  "origin": "172.17.0.1",
  "url": "http://127.0.0.1:8080/post"
}

[2020/10/16 21:18:57] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 is now available
[2020/10/16 21:18:57] [debug] [task] destroy task=0x81ba9c0 (task_id=0)
[2020/10/16 21:18:58] [debug] [task] created task=0x8222290 id=0 OK
[2020/10/16 21:18:58] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 has been assigned (recycled)
[2020/10/16 21:18:58] [debug] [output:stackdriver:stackdriver.0] [logging.googleapis.com/monitored_resource] not found in the payload
[2020/10/16 21:18:58] [debug] [output:stackdriver:stackdriver.0] HTTP Status=200
[2020/10/16 21:18:58] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 is now available
[2020/10/16 21:18:58] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 has been assigned (recycled)
[2020/10/16 21:18:58] [ info] [output:http:http.1] 127.0.0.1:8080, HTTP status=200
{
  "args": {},
  "data": "data:application/octet-stream;base64,ktcAX4oOQSL79NKBp21lc3NhZ2WlZHVtbXk=",
  "files": {},
  "form": {},
  "headers": {
    "Content-Length": "26",
    "Content-Type": "application/msgpack",
    "Host": "127.0.0.1:8080",
    "User-Agent": "Fluent-Bit"
  },
  "json": null,
  "origin": "172.17.0.1",
  "url": "http://127.0.0.1:8080/post"
}

[2020/10/16 21:18:58] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 is now available
[2020/10/16 21:18:58] [debug] [task] destroy task=0x8222290 (task_id=0)
[2020/10/16 21:18:59] [debug] [task] created task=0x8289b80 id=0 OK
[2020/10/16 21:18:59] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 has been assigned (recycled)
[2020/10/16 21:18:59] [debug] [output:stackdriver:stackdriver.0] [logging.googleapis.com/monitored_resource] not found in the payload
[2020/10/16 21:18:59] [debug] [output:stackdriver:stackdriver.0] HTTP Status=200
[2020/10/16 21:18:59] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 is now available
[2020/10/16 21:18:59] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 has been assigned (recycled)
[2020/10/16 21:18:59] [ info] [output:http:http.1] 127.0.0.1:8080, HTTP status=200
{
  "args": {},
  "data": "data:application/octet-stream;base64,ktcAX4oOQiJmJUeBp21lc3NhZ2WlZHVtbXk=",
  "files": {},
  "form": {},
  "headers": {
    "Content-Length": "26",
    "Content-Type": "application/msgpack",
    "Host": "127.0.0.1:8080",
    "User-Agent": "Fluent-Bit"
  },
  "json": null,
  "origin": "172.17.0.1",
  "url": "http://127.0.0.1:8080/post"
}

[2020/10/16 21:18:59] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 is now available
[2020/10/16 21:18:59] [debug] [task] destroy task=0x8289b80 (task_id=0)
[2020/10/16 21:19:00] [debug] [task] created task=0x82f1450 id=0 OK
[2020/10/16 21:19:00] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 has been assigned (recycled)
[2020/10/16 21:19:00] [debug] [output:stackdriver:stackdriver.0] [logging.googleapis.com/monitored_resource] not found in the payload
[2020/10/16 21:19:00] [debug] [output:stackdriver:stackdriver.0] HTTP Status=200
[2020/10/16 21:19:00] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 is now available
[2020/10/16 21:19:00] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 has been assigned (recycled)
[2020/10/16 21:19:00] [ info] [output:http:http.1] 127.0.0.1:8080, HTTP status=200
{
  "args": {},
  "data": "data:application/octet-stream;base64,ktcAX4oOQyM3slCBp21lc3NhZ2WlZHVtbXk=",
  "files": {},
  "form": {},
  "headers": {
    "Content-Length": "26",
    "Content-Type": "application/msgpack",
    "Host": "127.0.0.1:8080",
    "User-Agent": "Fluent-Bit"
  },
  "json": null,
  "origin": "172.17.0.1",
  "url": "http://127.0.0.1:8080/post"
}

[2020/10/16 21:19:00] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 is now available
[2020/10/16 21:19:00] [debug] [task] destroy task=0x82f1450 (task_id=0)
[2020/10/16 21:19:01] [debug] [task] created task=0x8358d20 id=0 OK
[2020/10/16 21:19:01] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 has been assigned (recycled)
[2020/10/16 21:19:01] [debug] [output:stackdriver:stackdriver.0] [logging.googleapis.com/monitored_resource] not found in the payload
[2020/10/16 21:19:01] [debug] [output:stackdriver:stackdriver.0] HTTP Status=200
[2020/10/16 21:19:01] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 is now available
[2020/10/16 21:19:01] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 has been assigned (recycled)
[2020/10/16 21:19:01] [ info] [output:http:http.1] 127.0.0.1:8080, HTTP status=200
{
  "args": {},
  "data": "data:application/octet-stream;base64,ktcAX4oORCabIWyBp21lc3NhZ2WlZHVtbXk=",
  "files": {},
  "form": {},
  "headers": {
    "Content-Length": "26",
    "Content-Type": "application/msgpack",
    "Host": "127.0.0.1:8080",
    "User-Agent": "Fluent-Bit"
  },
  "json": null,
  "origin": "172.17.0.1",
  "url": "http://127.0.0.1:8080/post"
}

[2020/10/16 21:19:01] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 is now available
[2020/10/16 21:19:01] [debug] [task] destroy task=0x8358d20 (task_id=0)
^C[2020/10/16 21:19:02] [engine] caught signal (SIGINT)
[2020/10/16 21:19:02] [debug] [task] created task=0x83c0640 id=0 OK
[2020/10/16 21:19:02] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 has been assigned (recycled)
[2020/10/16 21:19:02] [debug] [output:stackdriver:stackdriver.0] [logging.googleapis.com/monitored_resource] not found in the payload
[2020/10/16 21:19:02] [debug] [output:stackdriver:stackdriver.0] HTTP Status=200
[2020/10/16 21:19:02] [debug] [upstream] KA connection #26 to logging.googleapis.com:443 is now available
[2020/10/16 21:19:02] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 has been assigned (recycled)
[2020/10/16 21:19:02] [ info] [output:http:http.1] 127.0.0.1:8080, HTTP status=200
{
  "args": {},
  "data": "data:application/octet-stream;base64,ktcAX4oORSNxr96Bp21lc3NhZ2WlZHVtbXk=",
  "files": {},
  "form": {},
  "headers": {
    "Content-Length": "26",
    "Content-Type": "application/msgpack",
    "Host": "127.0.0.1:8080",
    "User-Agent": "Fluent-Bit"
  },
  "json": null,
  "origin": "172.17.0.1",
  "url": "http://127.0.0.1:8080/post"
}

[2020/10/16 21:19:02] [debug] [upstream] KA connection #27 to 127.0.0.1:8080 is now available
[2020/10/16 21:19:02] [ warn] [engine] service will stop in 5 seconds
[2020/10/16 21:19:02] [debug] [task] destroy task=0x83c0640 (task_id=0)
[2020/10/16 21:19:02] [debug] [input chunk] dummy.0 is paused, cannot append records
^C[2020/10/16 21:19:02] [engine] caught signal (SIGINT)
==10572==
==10572== HEAP SUMMARY:
==10572==     in use at exit: 2,262,537 bytes in 8,499 blocks
==10572==   total heap usage: 83,894 allocs, 75,395 frees, 13,084,635 bytes allocated
==10572==
==10572== LEAK SUMMARY:
==10572==    definitely lost: 0 bytes in 0 blocks
==10572==    indirectly lost: 0 bytes in 0 blocks
==10572==      possibly lost: 2,215,143 bytes in 8,451 blocks
==10572==    still reachable: 47,394 bytes in 48 blocks
==10572==         suppressed: 0 bytes in 0 blocks
==10572== Rerun with --leak-check=full to see details of leaked memory
==10572==
==10572== For counts of detected and suppressed errors, rerun with: -v
==10572== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

# yiyu @ yiyu-fluent-bit-dev in ~/src/fluent-bit/build on git:feature/metrics-name o [21:19:02]
$

# yiyu @ yiyu-fluent-bit-dev in ~/src/fluent-bit/build on git:feature/metrics-name o [21:19:02] C:130
$ e fluent-bit.config

# yiyu @ yiyu-fluent-bit-dev in ~/src/fluent-bit/build on git:feature/metrics-name o [21:22:55]
$ valgrind ./bin/fluent-bit -c fluent-bit.config
==10792== Memcheck, a memory error detector
==10792== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==10792== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==10792== Command: ./bin/fluent-bit -c fluent-bit.config
==10792==
Fluent Bit v1.7.0
* Copyright (C) 2019-2020 The Fluent Bit Authors
* Copyright (C) 2015-2018 Treasure Data
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
* https://fluentbit.io

[2020/10/16 21:22:58] [ info] Configuration:
[2020/10/16 21:22:58] [ info]  flush time     | 1.000000 seconds
[2020/10/16 21:22:58] [ info]  grace          | 5 seconds
[2020/10/16 21:22:58] [ info]  daemon         | 0
[2020/10/16 21:22:58] [ info] ___________
[2020/10/16 21:22:58] [ info]  inputs:
[2020/10/16 21:22:58] [ info]      dummy
[2020/10/16 21:22:58] [ info] ___________
[2020/10/16 21:22:58] [ info]  filters:
[2020/10/16 21:22:58] [ info] ___________
[2020/10/16 21:22:58] [ info]  outputs:
[2020/10/16 21:22:58] [ info]      http.0
[2020/10/16 21:22:58] [ info] ___________
[2020/10/16 21:22:58] [ info]  collectors:
[2020/10/16 21:22:58] [ info] [engine] started (pid=10792)
[2020/10/16 21:22:58] [debug] [engine] coroutine stack size: 24576 bytes (24.0K)
[2020/10/16 21:22:58] [debug] [storage] [cio stream] new stream registered: dummy.0
[2020/10/16 21:22:58] [ info] [storage] version=1.0.6, initializing...
[2020/10/16 21:22:58] [ info] [storage] in-memory
[2020/10/16 21:22:58] [ info] [storage] normal synchronization mode, checksum disabled, max_chunks_up=128
[2020/10/16 21:22:58] [debug] [router] match rule dummy.0:http.0
[2020/10/16 21:22:58] [ info] [sp] stream processor started
==10792== Warning: client switching stacks?  SP change: 0x6805948 --> 0x5c75130
==10792==          to suppress, use: --max-stackframe=12126232 or greater
==10792== Warning: client switching stacks?  SP change: 0x5c750a8 --> 0x6805948
==10792==          to suppress, use: --max-stackframe=12126368 or greater
==10792== Warning: client switching stacks?  SP change: 0x6805948 --> 0x5c750a8
==10792==          to suppress, use: --max-stackframe=12126368 or greater
==10792==          further instances of this message will not be shown.
[2020/10/16 21:23:00] [debug] [task] created task=0x5c6ed00 id=0 OK
[2020/10/16 21:23:00] [ info] [output:http:http.0] 127.0.0.1:8080, HTTP status=200
{
  "args": {},
  "data": "data:application/octet-stream;base64,ktcAX4oPMx5TXemBp21lc3NhZ2WlZHVtbXk=",
  "files": {},
  "form": {},
  "headers": {
    "Content-Length": "26",
    "Content-Type": "application/msgpack",
    "Host": "127.0.0.1:8080",
    "User-Agent": "Fluent-Bit"
  },
  "json": null,
  "origin": "172.17.0.1",
  "url": "http://127.0.0.1:8080/post"
}

[2020/10/16 21:23:00] [debug] [upstream] KA connection #25 to 127.0.0.1:8080 is now available
[2020/10/16 21:23:00] [debug] [task] destroy task=0x5c6ed00 (task_id=0)
[2020/10/16 21:23:01] [debug] [task] created task=0x5cc1850 id=0 OK
[2020/10/16 21:23:01] [debug] [upstream] KA connection #25 to 127.0.0.1:8080 has been assigned (recycled)
[2020/10/16 21:23:01] [ info] [output:http:http.0] 127.0.0.1:8080, HTTP status=200
{
  "args": {},
  "data": "data:application/octet-stream;base64,ktcAX4oPNCDrMrGBp21lc3NhZ2WlZHVtbXk=",
  "files": {},
  "form": {},
  "headers": {
    "Content-Length": "26",
    "Content-Type": "application/msgpack",
    "Host": "127.0.0.1:8080",
    "User-Agent": "Fluent-Bit"
  },
  "json": null,
  "origin": "172.17.0.1",
  "url": "http://127.0.0.1:8080/post"
}

[2020/10/16 21:23:01] [debug] [upstream] KA connection #25 to 127.0.0.1:8080 is now available
[2020/10/16 21:23:01] [debug] [task] destroy task=0x5cc1850 (task_id=0)
^C[2020/10/16 21:23:02] [engine] caught signal (SIGINT)
[2020/10/16 21:23:02] [debug] [task] created task=0x5d14200 id=0 OK
[2020/10/16 21:23:02] [debug] [upstream] KA connection #25 to 127.0.0.1:8080 has been assigned (recycled)
[2020/10/16 21:23:02] [ info] [output:http:http.0] 127.0.0.1:8080, HTTP status=200
{
  "args": {},
  "data": "data:application/octet-stream;base64,ktcAX4oPNR3gKH+Bp21lc3NhZ2WlZHVtbXk=",
  "files": {},
  "form": {},
  "headers": {
    "Content-Length": "26",
    "Content-Type": "application/msgpack",
    "Host": "127.0.0.1:8080",
    "User-Agent": "Fluent-Bit"
  },
  "json": null,
  "origin": "172.17.0.1",
  "url": "http://127.0.0.1:8080/post"
}

[2020/10/16 21:23:02] [debug] [upstream] KA connection #25 to 127.0.0.1:8080 is now available
[2020/10/16 21:23:02] [ warn] [engine] service will stop in 5 seconds
[2020/10/16 21:23:02] [debug] [task] destroy task=0x5d14200 (task_id=0)
[2020/10/16 21:23:02] [debug] [input chunk] dummy.0 is paused, cannot append records
^C[2020/10/16 21:23:03] [engine] caught signal (SIGINT)
==10792==
==10792== HEAP SUMMARY:
==10792==     in use at exit: 61,947 bytes in 189 blocks
==10792==   total heap usage: 397 allocs, 208 frees, 1,154,660 bytes allocated
==10792==
==10792== LEAK SUMMARY:
==10792==    definitely lost: 0 bytes in 0 blocks
==10792==    indirectly lost: 0 bytes in 0 blocks
==10792==      possibly lost: 14,553 bytes in 141 blocks
==10792==    still reachable: 47,394 bytes in 48 blocks
==10792==         suppressed: 0 bytes in 0 blocks
==10792== Rerun with --leak-check=full to see details of leaked memory
==10792==
==10792== For counts of detected and suppressed errors, rerun with: -v
==10792== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

Oct 16 '20 21:10 erain

Also added a unit test for flb_sds_cat_auto. This PR is ready for review.

Oct 23 '20 20:10 erain

@edsiper would you mind take another round of review? (I've addressed all the comments)

Nov 18 '20 15:11 erain

Friendly ping~

Dec 04 '20 21:12 erain