## Bug description

The grouped-by-month view in charts is hella confusing. The x-axis shows a date that does not reflect the value on the y-axis.

1. the y-axis shows the number for the END of the month
2. the x-axis reads as "beginning of the month"

![CleanShot 2024-02-05 at 10 23 30@2x](https://github.com/PostHog/posthog/assets/35429197/d78df745-8319-4b78-95fa-d96f18aee357)

### Comparison with daily grouping

Compare the "group by month" view with "group by day". The x-axis labeling aligns with the y-axis values. 

![CleanShot 2024-02-05 at 10 29 20@2x](https://github.com/PostHog/posthog/assets/35429197/998825fa-7406-4214-8310-8f173980f80c)


## How to reproduce

1. Group a chart by month 
2. select "unique events"

## Proposal 

### 1. easy fix - remove the "1." from the labelling

- will still confuse readers with "is this the beginning or end of the month"

![CleanShot 2024-02-05 at 10 23 30@2x](https://github.com/PostHog/posthog/assets/35429197/1a0ae6d4-0e02-4b32-86ab-7b0e069655ed)

### 2. correct fix - show end of month

- removes ambiguity from "is that the beginning or end of month"
- harder to implement because months have different end days

![CleanShot 2024-02-05 at 10 23 30@2x](https://github.com/PostHog/posthog/assets/35429197/61226346-7f97-4bcd-87bf-53fc83c75245)


cc @jannesblobel
posthog/utils.py
try:
        ping = get_client().get("@posthog-plugin-server/ping")
        return bool(ping and parser.isoparse(ping) > timezone.now() - relativedelta(seconds=30))
    except BaseException:
        return False
def get_plugin_server_version() -> Optional[str]:
    cache_key_value = get_client().get("@posthog-plugin-server/version")
    if cache_key_value:
        return cache_key_value.decode("utf-8")
    return None
def get_plugin_server_job_queues() -> Optional[List[str]]:
    cache_key_value = get_client().get("@posthog-plugin-server/enabled-job-queues")
    if cache_key_value:
        qs = cache_key_value.decode("utf-8").replace('"', "")
        return qs.split(",")
    return None
def is_object_storage_available() -> bool:
    from posthog.storage import object_storage
    try:
        if settings.OBJECT_STORAGE_ENABLED:
            return object_storage.health_check()
        else:
            return False
    except BaseException:
        return False
def get_redis_info() -> Mapping[str, Any]: