[Bug]: streaming seems to be adding a lag to the raw data timestamps for my Prometheus charts

[andrewm4894]

Bug description

related internal slack: https://netdata-cloud.slack.com/archives/CS3PB0VJ7/p1674554617334889

response from my child's nodes actual data:

# http://XXX:19999/api/v1/data?chart=prometheus_node_exporter_demo_cpu_1s.node_cpu_seconds_total-cpu_0-mode_idle&after=1674540987&before=1674542259

{
 "labels": ["time","node_cpu_seconds_total"],
    "data":
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}

response from that node via the parent:

# http://XXX:19999/host/ml-demo-ml-enabled/api/v1/data?chart=prometheus_node_exporter_demo_cpu_1s.node_cpu_seconds_total-cpu_0-mode_idle&after=1674540987&before=1674542259

{
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 [ 1674541128,0.8421466],
 [ 1674541127,0.8629656],
 [ 1674541126,0.7370048],
 [ 1674541125,0.6636675],
 [ 1674541124,0.7685154],
 [ 1674541123,0.8485502],
 [ 1674541122,0.8240382],
 [ 1674541121,0.7463791],
 [ 1674541120,0.6452697],
 [ 1674541119,0.7414535],
 [ 1674541118,0.8578348],
 [ 1674541117,0.8406335],
 [ 1674541116,0.7784666],
 [ 1674541115,0.7203022],
 [ 1674541114,0.7769427],
 [ 1674541113,0.8252555],
 [ 1674541112,0.6901808],
 [ 1674541111,0.6650578],
 [ 1674541110,0.7219867],
 [ 1674541109,0.7884851],
 [ 1674541108,0.835282],
 [ 1674541107,0.8288818],
 [ 1674541106,0.7665174],
 [ 1674541105,0.6289766],
 [ 1674541104,0.7262287],
 [ 1674541103,0.8230994],
 [ 1674541102,0.7803068],
 [ 1674541101,0.7825505],
 [ 1674541100,0.7824893],
 [ 1674541099,0.7946002],
 [ 1674541098,0.838532],
 [ 1674541097,0.8659923],
 [ 1674541096,0.7279214],
 [ 1674541095,0.6943971],
 [ 1674541094,0.8048393],
 [ 1674541093,0.8499561],
 [ 1674541092,0.8156193],
 [ 1674541091,0.7247069],
 [ 1674541090,0.6204073],
 [ 1674541089,0.7304959],
 [ 1674541088,0.8479533],
 [ 1674541087,0.8634851],
 [ 1674541086,0.7748578],
 [ 1674541085,0.6989789],
 [ 1674541084,0.7783531],
 [ 1674541083,0.8462514],
 [ 1674541082,0.8259969],
 [ 1674541081,0.7385384],
 [ 1674541080,0.7381271],
 [ 1674541079,0.8179995],
 [ 1674541078,0.8548884],
 [ 1674541077,0.8210992],
 [ 1674541076,0.7001891],
 [ 1674541075,0.622768],
 [ 1674541074,0.7395345],
 [ 1674541073,0.780743],
 [ 1674541072,0.7687204],
 [ 1674541071,0.8043924],
 [ 1674541070,0.7953675],
 [ 1674541069,0.8039498],
 [ 1674541068,0.8443716],
 [ 1674541067,0.8647848],
 [ 1674541066,0.7285648],
 [ 1674541065,0.6356248],
 [ 1674541064,0.7584208],
 [ 1674541063,0.8349127],
 [ 1674541062,0.793434],
 [ 1674541061,0.7869848],
 [ 1674541060,0.6059362],
 [ 1674541059,0.6742019],
 [ 1674541058,0.8378342],
 [ 1674541057,0.8516356],
 [ 1674541056,0.7791971],
 [ 1674541055,0.724883],
 [ 1674541054,0.778788],
 [ 1674541053,0.8321644],
 [ 1674541052,0.7864916],
 [ 1674541051,0.7198812],
 [ 1674541050,0.7294846],
 [ 1674541049,0.7913756],
 [ 1674541048,0.7382644],
 [ 1674541047,0.7565151],
 [ 1674541046,0.7622458],
 [ 1674541045,0.6120406],
 [ 1674541044,0.7012374],
 [ 1674541043,0.8385686],
 [ 1674541042,0.796565],
 [ 1674541041,0.7957515],
 [ 1674541040,0.7724969],
 [ 1674541039,0.8102516],
 [ 1674541038,0.8362175],
 [ 1674541037,0.8447336],
 [ 1674541036,0.7186273],
 [ 1674541035,0.6902153],
 [ 1674541034,0.8041287],
 [ 1674541033,0.8439308],
 [ 1674541032,0.810464],
 [ 1674541031,0.7437179],
 [ 1674541030,0.6270174],
 [ 1674541029,0.7169404],
 [ 1674541028,0.8387556],
 [ 1674541027,0.8556641],
 [ 1674541026,0.7885146],
 [ 1674541025,0.6935711],
 [ 1674541024,0.7375634],
 [ 1674541023,0.819567],
 [ 1674541022,0.8104106],
 [ 1674541021,0.7299558],
 [ 1674541020,0.7425745],
 [ 1674541019,0.8153234],
 [ 1674541018,0.8281683],
 [ 1674541017,0.8092072],
 [ 1674541016,0.7652133],
 [ 1674541015,0.6563132],
 [ 1674541014,0.7480191],
 [ 1674541013,0.7964754],
 [ 1674541012,0.7593702],
 [ 1674541011,0.7894977],
 [ 1674541010,0.7922486],
 [ 1674541009,0.7809963],
 [ 1674541008,0.8210597],
 [ 1674541007,0.8266555],
 [ 1674541006,0.6561865],
 [ 1674541005,0.6085042],
 [ 1674541004,0.7620448],
 [ 1674541003,0.8518151],
 [ 1674541002,0.8138474],
 [ 1674541001,0.7973613],
 [ 1674541000,0.6794756],
 [ 1674540999,0.7444228],
 [ 1674540998,0.8614582],
 [ 1674540997,0.8633897],
 [ 1674540996,0.7843598],
 [ 1674540995,0.718697],
 [ 1674540994,0.7680412],
 [ 1674540993,0.8093442],
 [ 1674540992,0.7400953],
 [ 1674540991,0.6779696],
 [ 1674540990,0.6222168],
 [ 1674540989,0.7435458],
 [ 1674540988,0.826392],
 [ 1674540987,0.774463]
]
}

two problems:
A. these seems to be a lag on the childs data in the parent.
B. the actual values are all also slightly different for some reason.

Expected behavior

child data should be accurate on the parent

for example at 1674540996 the value drops from 0.1386571 to 0 but on the parent version of this data the drop does not happen - instead it happens about 6mins later.

1674541380 - 1674540995 = 385 seconds later

also you can see from above that the actual raw values themselves are all a little different for some reason.

Steps to reproduce

unsure how reprobucilbe this is tbh

1. set up streaming
2. enabled Prometheus collector
3. compare some data
   ...

Installation method

kickstart.sh

System info

dsdas

Netdata build info

andrewmaguire@ml-demo-ml-enabled:~$ netdata -W buildinfo
Version: netdata v1.37.0-167-nightly
Configure options:  '--prefix=/usr' '--sysconfdir=/etc' '--localstatedir=/var' '--libexecdir=/usr/libexec' '--libdir=/usr/lib' '--with-zlib' '--with-math' '--with-user=netdata' '--with-bundled-protobuf' 'CFLAGS=-O2 -pipe' 'LDFLAGS='
Install type: custom
Features:
    dbengine:                   YES
    Native HTTPS:               YES
    Netdata Cloud:              YES 
    ACLK:                       YES
    TLS Host Verification:      YES
    Machine Learning:           YES
    Stream Compression:         YES
Libraries:
    protobuf:                YES (bundled)
    jemalloc:                NO
    JSON-C:                  YES
    libcap:                  NO
    libcrypto:               YES
    libm:                    YES
    tcalloc:                 NO
    zlib:                    YES
Plugins:
    apps:                    YES
    cgroup Network Tracking: YES
    CUPS:                    NO
    EBPF:                    YES
    IPMI:                    NO
    NFACCT:                  NO
    perf:                    YES
    slabinfo:                YES
    Xen:                     NO
    Xen VBD Error Tracking:  NO
Exporters:
    AWS Kinesis:             NO
    GCP PubSub:              NO
    MongoDB:                 NO
    Prometheus Remote Write: NO
Debug/Developer Features:
    Trace Allocations:       NO

Additional info

No response

[andrewm4894]

end result here is that if i look at the local dashboard of the child node itself i see the drops at ~06:16:

but if i look via the parent (which is what NC will do) i see its all shifted and the first drop now is at ~06.23 according to the parent which is wrong.

Note also: the values between the two nodes even after the shift is accounted for are also not identical - they are similar but not identical so for some reason its all been shifted on the parent and the actual values on the parent are not that of the child - they are somewhat close - hence which two shifted lines look similar - but not identical in actual values when you look at the api - so thats potentially a big issue here too.

[ilyam8]

@andrewm4894 this issue may be fixed in #14319. Can you please re-test?

[andrewm4894]

will do

[andrewm4894]

@ilyam8 this does not look to be fixed from what i can see:

left = looking via the parent
right = looking direct at the node

Same timeframes and charts but can see they look very different.

The size of the lag and difference in the numbers looks to be even more confusing now for some reason.

Will try explore more to see if can find anything else maybe useful.

andrewmaguire@ml-demo-parent:/netdata$ sudo git log
commit bf38a22f323be8fa2b35bf782068d903064530ed (HEAD -> master, origin/master, origin/HEAD)
Author: Emmanuel Vasilakis
Date:   Wed Jan 25 19:06:06 2023 +0200

    Revert "Misc SSL improvements" (#14327)
    
    Revert "Misc SSL improvements (#14317)"
    
    This reverts commit f4d017ccf7385df3e152eeb5ea1259702ab01043.

andrewmaguire@ml-demo-ml-enabled:/netdata$ sudo git log
commit bf38a22f323be8fa2b35bf782068d903064530ed (HEAD -> master, origin/master, origin/HEAD)
Author: Emmanuel Vasilakis
Date:   Wed Jan 25 19:06:06 2023 +0200

    Revert "Misc SSL improvements" (#14327)
    
    Revert "Misc SSL improvements (#14317)"
    
    This reverts commit f4d017ccf7385df3e152eeb5ea1259702ab01043.

[andrewm4894]

Note: it just seem to be affecting the Prometheus charts i have. All the other typical charts seem in line. Even other collectors i have enabled like alarms, pandas, and zscores all also seem to line up so just looks like the prom stuff i have configured like this:

jobs:

  - name: node_exporter_demo_cpu_1s
    url: https://node.demo.do.prometheus.io/metrics
    update_every: 1 
    selector:
      allow:
        - node_cpu*  

In case that might narrow it down.

[ilyam8]

@andrewm4894 it is been 3 dbengine2 improvements PRs since then, please re-test when u have time.

[andrewm4894]

just recreated now - will let things run for a while and then test again.

[ilyam8]

is the problem solved?

[andrewm4894]

@ilyam8 i don't seem to even see the data via the parent now for some reason. going to try investigate more

[andrewm4894]

best comparison i can get is this that still looks very different

[thefiredragon]

@andrewm4894 I've the same issue, streams to parent shows no metrics anymore

[ilyam8]

@thefiredragon doesn't look the same to me. What is your Netdata version? What is children nodes memory mode?

[andrewm4894]

(i'll retest today on my end on latest versions)

[andrewm4894]

looking better now - but will need to let it all run for a while to be sure:

[thefiredragon]

@ilyam8 sorry, my issue was not related to this issue, someone had disabled my firewall rules, so devices had only connected to the registry and stream goes into somewhere.

[ilyam8]

Closing as it appears to be fixed (#14318 (comment)). @andrewm4894 re-open if there are any problems. Also, I don't see it being prometheus specific. The only thing that distinguishes prometheus from any other collector is (default) update_every: it is 10 vs 1.

[andrewm4894]

@ilyam8 cool - i'll do one last recheck on my end and re-open if still seeing it - was looking ok after a few hours yesterday so will just do one more check to be sure.