Following my techno lust to explore something new
Primary goal
Ease of use, push openwrt metrics to service providers on inet instead of maintaining homelan solutions.
HighLevelDesign
Able to push openwrt metrics with telegraf to service providers InfluxDB v2 and Grafana on top.
Findings
Suggested route for timeseries db InfluxDBv2 is to use telegraf which is a formadible size ~60MB binary and does not comply with most package builds in openwrt which are mean and lean.
Think with InfluxDBv2 they dropped older collectd,opentsb protocols so telegraf is becoming somewhat of the new std to push data. From the influxdb perspective that is 
Telegraf does provide mipsel/mips tarball @ https://github.com/influxdata/telegraf/releases
Did ran in this issue mentioned @ OpenWrt & Telegraf
Then tried mipsel build but throws an Illegal instruction
Then found this @ https://github.com/influxdata/telegraf/pull/6153
pekindenis reported in with an asus RT-N10 and confirmed it working. 
Ok cool, my arch is similar so thought this might work then.
Tried the mentioned 1.12.0 build but again confronted with illegal instruction while running telegram binary
My arch
system type : Broadcom BCM4716
machine : Asus RT-N16
processor : 0
cpu model : MIPS 74Kc V4.0
BogoMIPS : 239.61
wait instruction : yes
microsecond timers : yes
tlb_entries : 64
extra interrupt vector : yes
hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb]
isa : mips1 mips2 mips32r1 mips32r2
ASEs implemented : mips16 dsp dsp2
Options implemented : tlb 4kex 4k_cache prefetch mcheck ejtag llsc dc_aliases vint perf_cntr_intr_bit nan_legacy nan_2008 perf
shadow register sets : 1
kscratch registers : 0
package : 0
core : 0
VCED exceptions : not available
VCEI exceptions : not available
Got crosscompiletoolchain ready but failed to execute on telegraf build as there a couple of unknowns to move forward.
Q1 are their any who succeeded on this arch to run telegraf
Q2 maybe when crosscompiling and with some depencies less a slimmer build can be made but to me this seems an daunting task. Did crosscompile often back in the day but still I see lots of "new" go dependencies I got no clue off
Q3 Is this telegraf binary ever going to run my arch as the binary is currently massive. Someone confirmed it work and that is even on a arch with even less resources available.
Any other thoughts
Telegraf elf
readelf -h telegraf.mipsel
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: MIPS R3000
Version: 0x1
Entry point address: 0x80378
Start of program headers: 52 (bytes into file)
Start of section headers: 276 (bytes into file)
Flags: 0x50001004, cpic, o32, mips32
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 7
Size of section headers: 40 (bytes)
Number of section headers: 13
Section header string table index: 3
---
readelf -h telegraf.mips
ELF Header:
Magic: 7f 45 4c 46 01 02 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, big endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: MIPS R3000
Version: 0x1
Entry point address: 0x80230
Start of program headers: 52 (bytes into file)
Start of section headers: 276 (bytes into file)
Flags: 0x50001004, cpic, o32, mips32
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 7
Size of section headers: 40 (bytes)
Number of section headers: 13
Section header string table index: 3