Is the observable Universe consistent with the cosmological principle?

The Cosmological Principle (CP) -- the notion that Universe is spatially isotropic and homogeneous on large scales underlies a century of progress in cosmology. It conventionally formulated through Friedmann-Lema\^itre-Robertson-Walker (FLRW) cosmologies as spacetime metric, culminates successful highly predictive $\Lambda$-Cold-Dark-Matter ($\Lambda$CDM) model. Yet, tensions have emerged within $\Lambda$CDM model, most notably statistically significant discrepancy value Hubble constant, $H_0$. Since cosmic expansion determined by single parameter intimately tied to CP, implications $H_0$ tension may extend beyond CP itself. This review surveys current observational hints for deviations from expectations highlighting synergies disagreements warrant further study. Setting aside debate about individual structures, potential include variations cosmological parameters sky, discrepancies dipoles, mysterious alignments quasar polarizations galaxy spins. While it possible host systematics are impacting results, equally plausible precision cosmology outgrown FLRW paradigm, an extremely pragmatic but non-fundamental symmetry assumption.